Chemistry, asked by Swetlani1643, 1 year ago

An atom contains 70 protons, 70 electrons, and 99 neutrons. What is the mass number?

Answers

Answered by shraddha8877

3

Mass number = proton + neutron
A= 70 +99
A = 169amu
Hence, the mass number is 169 atomic mass unit.

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