Question

The electronic states X and Y of an atom are depicted below:

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

$Y:1s^{2}2s^{2}2P^{6}3s^{2}3p^{6}4s^{1}$

Which of the following statements is not correct?

• A. X represents an alkali metal.
• B. Energy is required to change X into Y.
• C. Y represents ground state of the element.
• D. Less energy is required to remove an electron from X than from Y.

Answer 1

Answer: (D)

Less energy is required to remove an electron from X than from Y.

Answer 2

Given, $X = 1s^{2}2s^{2}2p^{6}3s^{1}$

$Y = 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}$

Less energy is required to remove an electron from X than Y, because the distance between the nucleus and valence shell in Y is greater as compared to X.