How many protons, neutrons, and electrons are in a neutral atom of Copper, Cu, w

Question

How many protons, neutrons, and electrons are in a neutral atom of Copper, Cu, with an atomic number of 29 and mass number of 64?

A. protons = 64, neutrons = 29, electrons = 29

B. protons = 35, neutrons = 29, electrons = 35

C. protons = 29, neutrons = 64, electrons = 35

D. protons = 29, neutrons = 35, electrons = 29

A. protons = 64, neutrons = 29, electrons = 29

B. protons = 35, neutrons = 29, electrons = 35

C. protons = 29, neutrons = 64, electrons = 35

D. protons = 29, neutrons = 35, electrons = 29

Explanation / Answer

the atomic number of copper is 29. This indicates the number of electrons copper will have. Since atom is electrically neutral, tihs is also the number of protons copper will have. The number of neutrons= mass number- atomic number=64-29= 35. So D is correct.

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