IDNLearn.com: Your one-stop destination for reliable answers to diverse questions. Find the information you need quickly and easily with our comprehensive and accurate Q&A platform.

An atom has 5 protons and 7 neutrons. What is its mass number?

Sagot :

mass number = protons + neutrons
mass number = 5 + 7
mass number = 12
Mass number = No. of protons + No. of neutrons

= 5 + 7

= 12 u.

Thus, the answer is 12 u.