Chapter 5, Problem 100A

Interpretation Introduction

Interpretation:

This is to be explained that a zinc atom contains a total of $18$ electron in its $3s,3p$ and $3d$ orbitals but its electron- dot structure show only two dots.

Concept introduction:

Electron dot structure represents the valence electrons around the elements. The electrons are denoted as dots around the symbol of the element.

Answer to Problem 100A

The electron- dot structure of zinc show only two dots because it only has $2$ valance electrons present in $4s$ orbital.

Explanation of Solution

Given: Zinc atom

Explanations:

Electronic configuration of Zinc = $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^2$

Electron- dot structure of Zinc atom

The number of dots around the symbol of the atom is the total number of valence electrons in the atom.

$2$ Valence electrons present in $4s$ orbital.

Conclusion

$2$ Valance electrons present in $4s$ orbital.