Question

6 multiple choice 1 point li + select the correct electron configuration for the species shown above. 1s² 2s¹ 1s¹ 1s² 2s² 1s²

Explanation:

Step1: Recall lithium's atomic number

Lithium (Li) has an atomic number of 3, so neutral Li has 3 electrons.

Step2: Consider the ion state

$Li^{+}$ has lost 1 electron. So it has 2 electrons.

Step3: Determine electron - configuration

The first energy level (n = 1) can hold 2 electrons in the 1s orbital. So the electron - configuration of $Li^{+}$ is $1s^{2}$.

Answer:

D. $1s^{2}$