Question

Which of the following can most easily form unipositive gaseous ion?

• A. $1s^{2}2s^{2}2p^{6}3s^2$
• B. $1s^{2}2s^{2}2p^{6}3s^{2}3p^1$
• C. $1s^{2}2s^{2}2p^{6}3s^{2}3p^2$
• D. $1s^{2}2s^{2}2p^{6}3s^{2}3p^3$

Answer 1

Answer: (B)

$1s^{2}2s^{2}2p^{6}3s^{2}3p^1$

The element with electronic configuration $1s^{2}2s^{2}2p^{6}3s^{2}3p^1$ can most easily form unipositive gaseous ion.

$1s^{2}2s^{2}2p^{6}3s^{2}3p^1$ readily loses an electron to form $1s^{2}2s^{2}2p^{6}3s^{2}3p^0$ which is stable electronic configuration as $3p$ subshell is empty and $3s$ subshell is completely filled.