Noble gases have _________ molecules.

_______ represents the element hydrogen.

The number of atoms of an element that can join together to form a molecule of that element is known

________ are good conductors of heat and electricity.

_________ are malleable and ductile.

Table salt is a compound that can be broken down into two elements which are ______ and chlorine.

_______ emit radiations which may be harmful.

________ are inert gases.

The symbolic representation of a compound is called its

Sodium and potassium are