Which pair of groups will have larger ionic radii compared to their atomic radii after gaining electrons? A Chalcogens and Alkaline Earth Metals B Halogens and Alkali Metals C Alkali and Alkaline Earth Metals D Transition and inner-transition metals E Chalcogens and Halogens

Mendeleev organized his periodic table in order of increasing atomic number in 1869.

Dmitri Mendeleev a Russian chemist organized his periodic table in 1869 by increasing atomic mass not atomic number. The organization by increasing atomic number occurred in the 20th century.

The Russian chemist Dmitri Mendeleev first organized the periodic table in 1869. However, it's important to note that Mendeleev initially arranged the elements based on increasing atomic mass. It was not until the 20th century that the periodic table was arranged by increasing atomic number. Thus Mendeleev himself did not organize the periodic table based on atomic number this happened much later after realization that periodic properties of the elements were better correlated with atomic number rather than atomic mass.

Mendeleev also predicted the existence of elements that were not yet discovered during his time and these elements when discovered followed the properties he had anticipated. This offered great validation to his version of the periodic table.

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First, calculate the molar mass of MgCl2:

Mg: 1 x 24.30 = 24.30

Cl: 2 x 35.45 = 70.9

   24.30 + 70.9 = 95.2g/mol

Mole = Mass / Molar Mass

2.70 moles = Mass / 95.2 g/mol

Mass = 2.70 mol x 95.2 g/mol

Mass = 257.04g

Answer: The mass of magnesium chloride is 257.1 grams.

Explanation:

To calculate the mass of magnesium chloride for given number of moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]

We are given:

Moles of magnesium chloride = 2.70 moles

Molar mass of magnesium chloride = 95.21 g/mol

Putting values in above equation, we get:

[tex]2.70moles=\frac{\text{Mass of magnesium chloride}}{95.21g/mol}\\\\\text{Mass of magnesium chloride}=(2.70mol\times 95.21g/mol)=257.1g[/tex]

Hence, the mass of magnesium chloride is 257.1 grams.

pretty sure its c 95% sure

The correct answer is A. The solution is acidic in nature.

According to standard PH scale ranges;

So in this solution PH of solution is 8. According to standard criteria unknown solution is acidic in nature.

If I am correct it should be nucleons

The collection of protons and neutrons in the center of the atom is called the nucleus.

The four basic needs of all living organisms are air (for respiration), water (a major component of living cells), food/nutrients (to supply energy and materials for growth and repair), and shelter/habitat (for protection from environment and predators).

All living organisms, irrespective of their size or complexity, have four basic needs for survival and proper functioning. These four needs include:

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The correct explanation is D.

Sodium being an Alkali Metal has a high tendency to lose its only valence electron to attain Neon configuration. In this process, it becomes positively charged, and hence becomes a Cation.

Chlorine is a non-metal that is one electron short of attaining Argon configuration, and hence readily takes the available electrons to become a negatively charged Anion. Since these two are oppositely charged, by the laws of electrostatics, they attract each other forming an Ionic Bond that requires considerable energy to break.

Answer:

the answer is d).

Explanation:

Where else but from the surroundings?

Answer : For an endothermic reaction the energy come from the surroundings.

Explanation :

Endothermic reaction : It is a type of chemical reaction in which the energy is absorbed by the surroundings. In this reaction, the energy of reactants are less than the energy of products.  The energy of reactant is greater than the energy of product.

Exothermic reaction : It is a type of chemical reaction in which the energy is released into the surroundings. In this reaction, the energy of reactants are more than the energy of products. The energy of product is greater than the energy of reactant.

Hence, the energy come from the surroundings that is needed for an endothermic reaction.

A sulfur atom has two unpaired electrons. Stable electron configurations are those where all electron shells or subshells are filled.

A sulfur atom, which has an atomic number of 16, has 16 electrons. The electron configuration for sulfur is 1s2 2s2 2p6 3s2 3p4. This shows that there are two electrons in the 1s subshell, two in the 2s, six in the 2p, two in the 3s, and four in the 3p. Unpaired electrons are those which occupy an atomic or molecular orbital by themselves, not forming a pair with another electron. In the case of sulfur, all the electrons in 1s, 2s, 2p, and 3s shells are paired. But in the 3p shell, there are four electrons, meaning two of them are unpaired electrons.

The phrase 'stable electron configurations are likely to contain' refers to atoms with fully filled electron shells or subshells. Atoms strive for a stable configuration, which typically means having full outer electron shells. This is the reason that noble gases are unreactive, as they have completely filled shells.

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Answer:

multiple voltaic cells that have spontaneous half reactions

Explanation:

A battery is an electrochemical device that stores energy. This is connected to an electrical circuit, and chemical energy is transformed into electrical energy. All are similar in construction, each of these cells is composed of a positive and a negative electrode in addition to a separator. When the battery is discharged, an electrochemical change occurs between the different materials in the two electrodes. The electrons are transported between the positive and negative electrodes through an external circuit (light bulbs, starter motors, etc.)

Answer:

i listened to that person ^^^

Explanation:

Edge doesnt give correct answers on unit tests, but i passed with an 88 :)

A cubic centimeter (cm³) is a unit used to measure volume. It is the volume of a cube with an edge length of exactly one centimeter.

A cubic centimeter (cm³) is a unit used to measure volume. It is the volume of a cube with an edge length of exactly one centimeter. One cubic centimeter is equivalent to one milliliter (mL) and is 1/1000 of a liter.

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While scalar quantities only include the magnitude, vector quantities include both the magnitude and the direction. Displacement is an example of vector quantities. Therefore, it includes magnitude and direction

mark brailiest please

Answer:

It signifies both magnitude and direction

Explanation:

A vector is a quantity which has both magnitude and direction.

A displacement is vector quantity whose length is shortest distance from initial to final position of a point. Displacement quantifies both distance and direction of imaginary motion along the straight line from initial position to final position.

Step 1) Determine the amount of energy the water absorbed, or gained, using q= mc∆T

q=(56g)(4.184 J/g°c)(58.7-25)

q=+7896.0448 J

Step 2) Let's think about what this means. The water must have gained 7896.0448 J of energy because its energy is positive.

This makes sense too, since the temperature of the water increased, and thus it must have gained energy. Knowing this, we can conclude that the metal placed into the water must have released 7896.0448 J of energy.

Since we know the metal released 7896.0448 J of energy, when we solve for the specific heat capacity of the metal, we have to put this number in as negative.

Step 3) Using q= mc∆T, solve for the specific heat capacity of the metal

-7896.0448 J=(26g)(c)(58.7-117)

c=5.209160047 J/g°c

ANSWER: the specific heat capacity of the metal is 5.2 J/g°c

Blue is the color that can be best absorbed, as orange is the color seen.

The answer is B, protein.

Answer: Option B) is the correct answer.

Explanation:

A polymer is defined as a molecule which has 'n' number of monomer units.

For example, [tex](CH_{2}=CH_{2})_{n}[/tex] is a poly ethene polymer.

Similarly, proteins are also polymers as they are made up of amino acids and contain number of repeated units just like polymers.

Thus, we can conclude that protein is made of polymers.

Answer:

A

Explanation:

i did it on a USA test prep :)

Answer- A

Explanation- Because you have to look at the symbols and remember which symbol goes with each chemical, if you don't then you could get confused.

A. Aluminum oxide. The correct name for the chemical formula Al2O3 is Aluminum oxide, which indicates that the compound is composed of two atoms of aluminum and three atoms of oxygen.

The correct name for the chemical formula Al2O3 is incorrectly named in options B and C. The prefix 'di-' in option D refers to having two of something, but the 'di-' prefix is not typically used in this context with ionic compounds. Therefore, the correct name for this chemical compound is Aluminum oxide (option A), reflecting that it contains two atoms of aluminum and three atoms of oxygen.

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i am pretty sure it is 4

The slope is 10

And the y-intercept is 1

Hope it helps

One is the plum pudding theory by Thomsons that theorized that positive and negative charges were randomly distributed in an atom. This was later discovered that the positive charge was located at the small nucleus center of the atoms and negative electrons  on the outside.

Another is the aspect in Bohr model theory that electron orbit the nucleus like planets orbit the sun.  Quantum mechanisms have come to disprove this and identify that electron orbit can only be predicted by probabilities and not in the certainty of their position around the nucleus of the atom. They randomly skip and hop (disappear and reappear) at positions around the nucleus.

combination of elements on the periodic table to create a substance. so I think I understand about this okay but I have a 98% on that type of subject

The formula is density = mass / Volume

density = 1.7 g/mL

mass = 95 grams

Volume = ?

1.7 g/mL = 95 g / Volume

Volume = 95 g / 1.7 g/mL

Volume = 55.88 mL

Hope this help!

The correct answer is  "microphone - transmitter - radio"

The  order of the technology used to transmit a sound through the radio which makes use of electromagnetic waves  is microphone - transmitter - radio".

The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.

The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.

In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.

Learn more about electromagnetic waves,here:

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Mass number is the number of protons and neutrons in an atom, and it tells us about the mass of the atom in amu, or atomic mass units. Atomic mass is the average mass of all the isotopes of a certain type. It is a weighted average that takes into account the abundances of all of the different isotopes

hope this helps :)

The difference between the atomic number and the mass number is atomic number is the total number of protons of an element, and atomic mass is the total number of neutrons and protons.

The atomic number is the nuclear charge number of an element. It is depicted by the total number of protons present in the atoms of the element.

The mass number is also known as the atomic mass number and nucleon number of the element. The total protons and neutrons are the mass numbers.

A mass number, also known as an atomic mass unit, is a measurement of an atom's mass in protons and neutrons. The average mass of all isotopes of a particular kind is known as the atomic mass.

Thus, the total number of protons in an element is represented by the atomic number, whereas the total amount of neutrons and protons is represented by the atomic mass.

To learn more about the atomic number and atomic mass, refer to the link:

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Final answer:

The mass of water produced from the reaction of 3.03 g of butane with excess oxygen is approximately 4.69 grams.

Explanation:

To calculate the mass of water (H₂O) produced from the reaction of butane (C₄H₁₀) with excess oxygen (O₂), we need to use the balanced chemical equation for the combustion of butane:

C₄H₁₀(g) + 6O₂(g) → 4CO₂(g) + 5H₂O(l)

From the balanced equation, we can see that 1 mole of butane produces 5 moles of water. First, we'll need to calculate the number of moles of butane we have:

Butane has a molar mass of 58.12 g/mol (44.10 for carbon + 14.02 for hydrogen), so:

Moles of butane = 3.03 g / 58.12 g/mol ≈ 0.0521 mol

Since 1 mole of butane produces 5 moles of water, the moles of water produced will be:

Moles of H₂O = 0.0521 mol butane x 5 moles H₂O/mol butane = 0.2605 mol H₂O

Finally, we calculate the mass of water produced using the molar mass of water, which is approximately 18.02 g/mol:

Mass of H₂O = 0.2605 mol x 18.02 g/mol ≈ 4.69 g

Therefore, the mass of water produced is about 4.69 g.

Answer:

First , second energy levels are complete where as third energy level is not.

Explanation:

Electronic configuration is defined as distribution of electrons of an element in its various energy levels.

Chlorine has an atomic number of 17. Which means that its has 17 proton and 17 electrons.

Electronic configuration of chlorine is given as:

[tex]Cl=1s^22s^2p^63s^23p^5[/tex]

Energy level which fully filled are : 1s , 2s , 2p

Energy level which are not fully filled are : 3s, 3p

First , second energy levels are complete where as third energy level is not.

The chlorine atom has 2 electrons in the 1st energy level, 8 in the 2nd, and 7 in the 3rd. The first two energy levels are full while the 3rd energy level is not full as it could accommodate one more electron.

The electron configuration for a chlorine atom is [Ne] 3s2 3p5. This stands for 1s2 2s2 2p6 3s2 3p5 considering the entire configuration. To calculate the total number of electrons in each energy level, we first need to understand that the number in front of the 's' or 'p' (also 'd' or 'f' in larger atoms) represents the principal quantum number, also known the energy level of the electrons.

So, the total number of electrons for each energy level is as follows:

Now, as we know that the 1st energy level (s-orbital) can hold up to 2 electrons, 2nd level (s and p orbitals) can hold up to 8 electrons, and the 3rd one can hold up to 18 (but due to it being a p-element, chlorine will only use up to 8), we conclude that the 3rd energy level is not full because it has 7 electrons while it could hold at least one more.

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The balanced decomposition reaction of Potassium chlorate is 2KClO3 —-> 2KCl + 3O2, where the coefficient in front of KCl is 2. Answer to the question is (b) 2.

When balancing the decomposition reaction of Potassium chlorate (KClO3) to form Potassium chloride (KCl) and Oxygen (O2), you will aim to have the same number of atoms of each element on both sides of the equation. The balanced chemical equation for this reaction is:

2KClO3 —-> 2KCl + 3O2

According to the balanced equation, the correct coefficient in front of KCl is 2. Therefore, the answer to the question is (b) 2.

Jupiter, I believe?

The distance between Jupiter, which is 778.6 million kilometers, and the Sun is approximately 5.2 Astronomical Units (AU). An AU, or the average distance from Earth to the Sun, is approximately 149.6 million kilometers.

The planet whose distance from the Sun is approximately 778,600,000 km is Jupiter. Consider that 1 Astronomical Unit (AU) - the average distance from the Earth to the Sun - is about 149,597,870,700 meters or 149.6 million kilometers. So, when we compare this to the distance of Jupiter, we find it's around 5.2 AU from the Sun. Jupiter, being the largest planet in our solar system and located beyond the asteroid belt, is indeed far from the sun. However, this increases its year length, experiencing longer periods between each full orbit of the Sun.

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The number of particles  that  are in 12.7  moles of  compound that Jessica had is     7.65 x10^24 particles  of compound ( answer E)

    Calculation

The number  of particles are calculated  using the Avogadro's Principle  constant.

             what about 12.7 moles  of  compound=   ?  particles\

   by use of  cross multiplication

 N.b moles and moles cancels each  other

Answer:

76.5 x 10^24

Explanation:

This is correct :)