What is the electronic configuration of the ground state of the magnesium cation, $M{g}^{2+}$ ?

Q. The electronic configuration of few elements is given below. Mark the statement which is not correct about these elements.
(i) $1s^{2}2s^{2}2p^{6}3s^1$
(ii) $1s^{2}2s^{2}2p^5$
(iii) $1s^{2}2s^{2}2p^6$
(iv) $1s^{2}2s^{2}2p^3$

Q. Which element has the electronic configuration of $1s^{2}2s^{2}2p^6$?

Q. Electronic configurations of four elements $A,B,C$ and $D$ are given below:
(A) $1s^{2}2s^{2}2p^6$
(B) $1s^{2}2s^{2}2p^4$
(C) $1s^{2}2s^{2}2p^{6}3s^1$
(D) $1s^{2}2s^{2}2p^5$
Which of the following is the correct order of increasing tendency to gain electron?

Q. Element with electronic configuration $1s^{2}2s^{2}2p^{6}3s^2$ is a _________.