La) What is meant by the term Basic Quantities.

A basic quantity is basically the physical quantity that can not be defined in terms of other quantities.

Explanation:

A basic quantity is basically the physical quantity that can not be defined in terms of other quantities.

Some of the names of the basic quantities include:

Mass, denoted by the symbol 'm', with S.I. unit 'kg'Length, denoted by symbol 'l', with S.I. unit 'm'Time, denoted by symbol 't', with S.I. unit 's'Current, denoted by 'I', with S.I. unit 's' 'A'Temperature, denoted by 'T', with S.I. unit 'K'Amount of substance, denoted by 'n', with S.I. unit 'mol'Luminous Intensity, denoted by 'Iv', with S.I. unit 'cd'A basic quantity is chosen arbitrarily.

Protons have a positive charge and, collectively, give an element its atomic number.