Chapter 6, Problem 75A

Interpretation Introduction

Interpretation:

The name of the metalloid in period 2 of the periodic table and compounds used as water softeners needs to be determined.

Concept introduction:

Metalloids are those which show the intermediate properties between metal and non-metals. In the periodic table, they are found between boron and aluminium to the line between polonium and astatine.

Answer to Problem 75A

Boron is a metalloid that appears in the periodic table in period 2. Borax is the compound of it which is used as water softener.

Explanation of Solution

The metalloid located in period 2 is boron. It has the characteristic of both metals and non-metals. It is represented by symbol B and its atomic number is five. An important compound of boron is borax its chemical formula is ${\text{Na}}_{\text{2}}{\text{B}}_{\text{4}}{\text{O}}_{\text{7}}{\text{.10H}}_{\text{2}}\text{O}$. This compound of boron is used as a water softener. The compound is also known as sodium tetraborate.