Phosphorous is

_______ are substances that cannot be separated into simpler substances.

The symbolic representation of a compound is called its

Elements and Compounds are ______ substances.

H₂ is

A non - metal which is a good conductor of heat and electricity is

________ are inert gases.

Atoms of same elements are

_______ do not react chemically with other elements or compounds.

Two or more atoms of the same element combine to form molecules of