Respuesta :
Answer: 20
Explanation: Mass number is the number of neutrons plus the number of protons. 8 + 12 gives 20.
Mass number
- No of protons+No of neutrons
- 12+8
- 20
Mass number is 20
Answer: 20
Explanation: Mass number is the number of neutrons plus the number of protons. 8 + 12 gives 20.
Mass number
Mass number is 20