Chapter 17, Problem 2A

To determine

The element which has the lightest atoms.

Explanation of Solution

Introduction:

The building blocks of matter are atoms. A material composed of only one kind of atoms is known as element.

There are 118 elements known still date. Hydrogen has atomic number 1. It has only one proton. So, it is lightest element of atoms.

Conclusion:

Hydrogen is element of lightest atoms.