Question

use the periodic table in the tools bar to complete the electron configurations for the following elements: lithium (li): 1s^a2s^b a = 2 b = 1 complete beryllium (be): 1s^c2s^d c = d = done

Explanation:

Step1: Determine beryllium's atomic number

Beryllium has an atomic number of 4, meaning it has 4 electrons.

Step2: Fill electron - shells

The first shell (1s) can hold a maximum of 2 electrons. After filling the 1s shell with 2 electrons, we have 2 remaining electrons. These 2 remaining electrons go into the 2s shell.

Answer:

C = 2
D = 2