Chapter 9.2, Problem 9.2E

Interpretation Introduction

Interpretation:

The electronic configuration of Calcium and Sulfur has to be discussed via Lewis electron-dot symbols method.

Concept introduction:

Lewis electron-dot symbols.

${\text{Ca}}^{\text{2+}}\text{is Group IIA, and}\text{Z= 20}$, so there are 20 electrons in the neutral atom and 18 in the ion.  S^2– is Group VIA, and Z = 16, so there are 16 electrons in the neutral atom and 18 in the ion.

All stable molecules attain the noble gas and octet arrangement.  So that molecule is more stable and less reactive nature.

According to Octet rule eight electrons in the outer most shell that atoms is most stable arrangement in other atoms have less than eight electrons.