An atom has 5 protons, 2 neutrons, and 5 electrons. Which of the following is the atom's mass number?

Name: An atom has 5 protons, 2 neutrons, and 5 electrons. Which of the following is the atom's mass number?
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Question

Quizplus · Accepted Answer

To calculate the atomic mass of a single atom of an element, add up the mass of protons and neutrons. In this case, you should add 5 and 2, which equals to 7. Electrons are so small, they are not factored into the atomic mass.

An Atom Has 5 Protons, 2 Neutrons, and 5 Electrons