Question

Among the following which can get innert gas configuration by gain of electrons?
A}Magnesium B}Fluorine C}Calcium D}Potassium

Answer 1

option a.....mangnesium

Answer 2

Answer:

From the given elements, only fluorine can get an inert gas configuration by the gain of electrons.

Therefore, option B) Fluorine is the correct option.

Explanation:

Inert gas configuration:

• The electronic configuration of all the inert gases is $ns^{2} np^{6}$ in their outermost shells, except for helium, which has an electronic configuration of $ns^{2}$.
• The elements of group 18 are known as inert gases or noble gases.
• These gases are called inert gases because of their stability.

Therefore,

• Other elements can gain stability by attaining the inert gas configuration.

A) Magnesium:

• The atomic number of magnesium is $12$.

Therefore,

• The electronic configuration = $1s^{2} 2s^{2} 2p^{6} 3s^{2}$.

Now,

• Magnesium can attain an inert gas configuration by losing the 2 electrons.
• Mg²⁺ electronic configuration = $1s^{2} 2s^{2} 2p^{6}$.

B) Fluorine:

• The atomic number of fluorine is $9$.

Therefore,

• The electronic configuration = $1s^{2} 2s^{2} 2p^{5}$.

Now,

• Fluorine can attain an inert gas configuration by gaining an electron.
• F⁻ electronic configuration of = $1s^{2} 2s^{2} 2p^{6}$.

C) Calcium:

• The atomic number of calcium is $20$.

Therefore,

• The electronic configuration = $1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2}$.

Now,

• Calcium can attain an inert gas configuration by losing two electrons.
• Ca²⁺ electronic configuration = $1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6}$.

D) Potassium:

• The atomic number of potassium is $19$.

Therefore,

• The electronic configuration = $1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{1}$.

Now,

• Potassium can attain an inert gas configuration by losing an electron.
• K⁺ electronic configuration = $1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6}$.

Hence, from the above elements, only fluorine can get an inert gas configuration by the gain of electrons.