Question

Which of the following can lose two electrons to attain the configuration of argon?

• A. Mg
• B. Br
• C. S
• D. Ca

Answer 1

Answer: (D)

Ca

Ca $\left(\right[Ar\left]4s^2\right)$ can lose two electrons to attain the configuration of argon.

Mg $\left(\right[Ne\left]3s^2\right)$ can lose two electrons to attain the configuration of neon.

Br $\left(\right[Ar\left]3d^{10}4s^{2}4p^5\right)$ can gain one electron to attain the configuration of krypton.

S $\left(\right[Ne\left]3s^{2}3p^4\right)$ can gain two electrons to attain the configuration of argon.