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 = 2 b = 1 complete beryllium (be): 1s^c2s^d c = d = done

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

Answer

Explanation:

Step1: Determine beryllium's atomic number

Beryllium has atomic number 4.

Step2: Fill electron - shells

Electrons fill the 1s orbital first. The 1s orbital can hold a maximum of 2 electrons. Then, the remaining electrons go to the 2s orbital. Since there are 4 electrons in beryllium, 2 go to 1s and 2 go to 2s. So for the electron - configuration $1s^{C}2s^{D}$, $C = 2$ and $D = 2$.

Answer:

$C = 2$ $D = 2$