Question

use the periodic table in the tools bar to complete the electron configurations for the following elements:
lithium (li) ( 1s^{a}2s^{b} )
( a=)
( b=)

Explanation:

Step1: Determine the atomic number of lithium

The atomic number of lithium (Li) is \(3\).

Step2: Fill the electron shells

The first shell (\(n = 1\)) can hold a maximum of \(2\) electrons. So, \(2\) electrons go into the \(1s\) orbital.
The remaining \(3- 2=1\) electron goes into the \(2s\) orbital.

Answer:

\(A = 2\), \(B = 1\)