Question

an atom has 54 protons, 54 electrons, and 131 neutrons. what is the atomic number of the atom? 131 54 77 185

Explanation:

Step1: Recall atomic number definition

The atomic number of an atom is defined as the number of protons in its nucleus.

Step2: Identify number of protons

The atom has 54 protons. By the definition of atomic number, the atomic number should equal the number of protons.

Answer:

B. 54