Question

the electronic configuration of atomic number 20 of an atom is which of the following​

Answer 1

Answer in image attached!!!

Answer 2

$\huge\mathbb{\fcolorbox{lightgreen} {purple}{Answer:}}$

⟹ The electronic configuration of Calcium(ca) is

2 , 8 , 8 , 2 .

$\mathcal\color{lime}I\:hope\:it\:helps\:you.$