Question

question 7 of 10
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. 34
c. 63
d. 92

Explanation:

Step1: Recall atomic number concept

The atomic number of an element is equal to the number of protons in its nucleus.

Step2: Identify atomic number

Given that the atomic number of copper is 29. So the number of protons is 29.

Answer:

A. 29