use the periodic table in the tools bar to complete the electron configurations for the following elements…

use the periodic table in the tools bar to complete the electron configurations for the following elements: lithium (li): 1s^a2s^b a = b = done

use the periodic table in the tools bar to complete the electron configurations for the following elements: lithium (li): 1s^a2s^b a = b = done

Answer

Explanation:

Step1: Recall lithium's atomic number

Lithium has atomic number 3.

Step2: Determine electron - filling

Electrons fill orbitals starting from the lowest - energy ones. The 1s orbital can hold 2 electrons and the 2s orbital can hold 2 electrons. For lithium with 3 electrons, 2 electrons go in 1s and 1 electron goes in 2s.

Answer:

A = 2 B = 1