Question

3. Which of the following could represent an element in an excited state?Is² 2s²2p¹a.b. 1s² 2s¹ 2p²C.1s² 2s²2p5d. 1s² 2s² 2p 3s¹

Answer 1

Answer:

$D$

Explanation:

Here, we want to select the option that represents the electronic configuration of an element in the excited state

When an element is in the excited state, electrons are promoted

In the excited state, the last electron would reside in a higher energy orbital

This is the case seen in the following configuration:

$1s^2\text{ 2s}^2\text{ 2p 3s}^1$

There is a promotion from the 2p to the 3s orbital