Chapter 8.1, Problem 3LC

Interpretation Introduction

Interpretation: The elements that exist in nature as uncombine atoms need to be identified. The term used for such elements needs to be given.

Concept Introduction: Elements can be defined as substances that cannot be broken into simpler substances by simple chemical reactions. An element is composed of its atoms and all elements have unique types of atoms.

Explanation of Solution

All elements are composed of atoms. Each element has its own atom and the difference is in the number of protons, neutrons, and electrons present in the atom. Generally, elements are present as combined atoms (to complete octet) but some elements exist in nature as uncombine atoms. Elements are present as combined atoms because each atom must have a complete octet to become stable.

The elements with already complete octets exist in nature as uncombine form. This is because they are already stable and do not require any combination. They are monoatomic as they have a single atom.

The elements from group 18 have complete octets and they are stable. The term used for such elements is noble gas or inert gas.