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\na = \n\nb = \n\ndone

use the periodic table in the tools bar to complete the electron configurations for the following elements: lithium (li): 1s^a2s^b\na = \n\nb = \n\ndone

Answer

Explanation:

Step1: Determine lithium's atomic number

Lithium (Li) has an atomic number of 3, which means it has 3 electrons.

Step2: Fill the electron - shells

Electrons fill the 1s orbital first. The 1s orbital can hold a maximum of 2 electrons. So, for the 1s part of the electron - configuration, $A = 2$. Then, the remaining $3 - 2=1$ electron goes into the 2s orbital. So, $B = 1$.

Answer:

$A = 2$ $B = 1$