Atomic structure and isotopes

Question 1

Isotope

Answer 1

Isotopes are atoms of the same element that have the same number of protons (& electrons) but different numbers of neutrons (& masses)

Question 2

Relative atomic mass ,Ar

Answer 2

the weighted mean mass of an atom of an element compared to 1/12 of the mass of one atom of carbon-12.

Question 3

Relative molecular mass, Mr

Answer 3

The weighted mean mass of a molecule of a compound compared with one twelfth of the mass of one atom of carbon-12.

Question 4

Relative Isotopic mass

Answer 4

The mass of one isotope compared with one twelfth of the mass of one atom of carbon-12.