Question

question 3 of 25
an atom of copper (cu) has a mass number of 63 and an atomic number of 29. how many protons does it have?

a. 29

b. 63

c. 34

d. 92

Explanation:

In atomic structure, the atomic number of an element is equal to the number of protons in its nucleus. For copper, the atomic number is given as 29, so the number of protons is also 29.

Answer:

A. 29