2. Atoms and electrons

Question 1

isotopes

Answer 1

Atoms with the same number of protons, although a different number of neutrons.

Question 2

Relative isotopic mass

Answer 2

Mass of an atom of an isotope compared with one twelfth of the mass of an atom of Carbon 12

Question 3

Relative atomic mass

Answer 3

Average weighted mass of an atom of an element compared with one twelfth of the mass of an atom of Carbon 12.

Question 4

amount of substance

Answer 4

A quantity whose unit is the mole, used as a means of counting the number of atoms.

Question 5

Avogadro constant

Answer 5

the number of particles per mole (6.02 × 1023 mol–1);