Chapter 8, Problem 8.78QP

Interpretation Introduction

Interpretation:

Element M and X has to be determined from the given data.

Concept Introduction:

According to physical and chemical properties, the elements can be further divided into metals, non-metals and metalloids.

In a group, the metallic character of an element increases from top to bottom whereas in a period, it decreases from left to right.

Nonmetals are elements that usually contain 4-8 outer shell electrons. A nonmetal can be easily broken, that is they are brittle. They cannot conduct heat and electricity.

Metals are elements that usually contain 1-3 outer shell electrons. They can conduct heat and electricity. Metals usually look shining and lustrous.

$KBr$ is a brittle white solid that conducts electricity on molten state or when dissolved in water. Potassium and bromide react to form $KBr$. The melting point of $KBr$ is $734°C$