jg200567
contestada

What is the mass number of an atom equal to?

the number of protons plus the number of electrons in an atom


the number of protons plus the number of neutrons in a nucleus


the number of electrons circling the nucleus of an atom


the number of protons in a nucleus

Respuesta :

Nisthalimbu

Answer:

number of protons plus the number of electrons in an atom

Answer: the number of electrons circling the nucleus of an atom

Explanation: