- Have the same atomic number but different atomic mass numbers
- Same number of protons and electrons but a different number of neutrons
- React in the same way because they have the same electronic configuration
Relative Atomic Mass (A )= Mass of the element:
- carbon = 12
- Oxygen = 16
- Magnesium = 24
Relative Formula Mass (M )= Mass of the compound:
- NaCl- Sodium Chloride = 23 + 35.5 = 58.5
- Al O - Aluminium Oxide = (2 x 27) + (3 x 16) = 102
Comments
No comments have yet been made