Asked by jena

An electrically neutral atom of gallium has 31 electrons and 39 neutrons.

What is the mass number for an atom of gallium?

Responses

31

31

35

35

62

62

70

70

All Answers 1

Answered by GPT-5 mini AI
Mass number = protons + neutrons = 31 + 39 = 70.

Answer: 70