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4 years ago

Which statement describes how an atom in the ground state becomes excited

1 answer:

4 0

The ground state of an electron, the energy level it normally occupies, is the state of lowest energy for that electron. ... An electron can become excited if it is given extra energy, such as if it absorbs a photon, or packet of light, or collides with a nearby atom or particle. (I do not take credit for that answer)

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The atomic number of Magnesium is 12. Which of the following answers is true? (Choose all that apply)

Umnica [9.8K]

Answer : The correct options are:

(b) Magnesium has 2 electrons in it's valence shell

(d) Magnesium is neutral in it's elemental form

Explanation :

Atomic number : It is defined as the number of protons or number of electrons.

Atomic number = number of protons = number of electrons

Mass number : It is defined as the sum of number of protons and number of neutrons.

Number of neutrons = Mass number - Number of protons

Electronic configuration : It is defined as the representation of electrons around the nucleus of an atom.

Number of electrons in an atom are determined by the electronic configuration.

As we are given :

Atomic number of magnesium = 12

Number of protons = Number of electrons = 12

Magnesium is the alkaline earth metal that belongs to group 2 and has 12 electrons in their shell.

The electronic configuration of magnesium (Mg) will be:

$1s^22s^22p^63s^2$

From this we conclude that, there are 2 electrons in it's outermost or valence shell and it is neutral in it's elemental form because magnesium has same number of protons and electrons.

Hence, the correct options are, (b) and (d)

5 0

3 years ago

The flow of current is always in what direction

Ede4ka [16]

Answer:

The direction of an electric current is by convention the direction in which a positive charge would move. Thus, the current in the external circuit is directed away from the positive terminal and toward the negative terminal of the battery.

Explanation:

5 0

3 years ago

Read 2 more answers

In order to calculate how many neutrons are in an atom, you must subtract the mass number from the number of protons? Neutrons =

Inessa05 [86]

Answer:

True.

Explanation:

The mass number of an atom can be calculated using no of protons and the no of neutrons.

Mass number = no of protons + no of neutrons

We can rearrange the above formula to find the no of neutrons as follows :

no of neutrons = Mass number - no of protons

Neutrons = Mass - protons.

Hence, the given statement is true.

4 0

3 years ago

6th grade science i mark as brainliest

Tom [10]

Gabriel is accelerating on his bike

7 0

3 years ago

The solubility of two slightly soluble salts of M^2+ , MA and MZ_2, are the same, 4 x 10^â4 mol/L.

LekaFEV [45]

Answer:

a) MZ₂

b) They have the same concentration

c) 4x10⁻⁴ mol/L

Explanation:

a) The solubility (S) is the concentration of the salt that will be dissociated and form the ions in the solution, the solubility product constant (Kps) is the multiplication of the concentration of the ions elevated at their coefficients. The concentration of the ions depends on the stoichiometry and will be equivalent to S.

The salts solubilization reactions and their Kps values are:

MA(s) ⇄ M⁺²(aq) + A⁻²(aq) Kps = S*S = S²

MZ₂(aq) ⇄ M⁺²(aq) + 2Z⁻(aq) Kps = S*S² = S³

Thus, the Kps of MZ₂ has a larger value.

b) A saturated solution is a solution that has the maximum amount of salt dissolved, so, the concentration dissolved is solubility. As we can notice from the reactions, the concentration of M⁺² is the same for both salts.

c) The equilibrium will be not modified because the salts have the same solubility. So, let's suppose that the volume of each one is 1 L, so the number of moles of the cation in each one is 4x10⁻⁴ mol. The total number of moles is 8x10⁻⁴ mol, and the concentration is:

8x10⁻⁴ mol/2 L = 4x10⁻⁴ mol/L.

7 0

3 years ago