Question

Define atomic number, mass number, relative atomic mass, relatives molecular mass and isotopes.

Answer 1

Answer:

1. ATOMIC NUMBER IS THE NUMBER WHICH REPRESENTS THE NUMBER OF PROTON IN A ATOM.
2. MASS NUMBER IS THE TOTAL NUMBER OF PROTONS AND NEUTRONS.
3. atomic weight OR relative atomic mass number is a dimensionless physical quantity defined as the ratio of the average mass of atoms of a chemical element in a given sample to the atomic mass constant.
4. the ratio of the average mass of one molecule of an element or compound to one twelfth of the mass of an atom of carbon-12.
5. Isotopes are variants of a particular chemical element which differ in neutron number, and consequently in nucleon number.

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Answer 2

Answer:

relative atomic mass- it is the average mass of the atom, as compaired to 1/12th the mass of one atom of carbon_12.

molecular mass - it is the sum of atomic mass of the atoms in a molecule.