Question

The electronic configuration $1s^2,2s^2, 2p^6, 3s^1$ and $3p^1$ is correctly describe by

• A. The excited state of $Mg^+$
• B. The excited state of $Na^+$
• C. The excited state of Mg
• D. The excited state of Al

Answer 1

Answer: (A)

The excited state of $Mg^+$

Answer 2

Atomic number of $Mg = 12$. It has $12$ electrons. $\therefore$ $\underset{\text{12 l}}{ {Mg}}$ ${->[-l]}$ $\underset{\text{11 l}}{ {Mg+}}$ So it is excited state of $Mg^+$