Question

question 19 of 25
an atom of aluminum (al) has an atomic number of 13 and a mass number of 27. how many neutrons does it have?
a. 13
b. 40
c. 27
d. 14

Explanation:

Step1: Recall the relationship formula

Mass number = Protons + Neutrons. Atomic number = Protons.

Step2: Identify the values

Atomic number of Al is 13 (so protons = 13), mass number is 27.

Step3: Calculate neutrons

Neutrons = Mass number - Protons = 27 - 13.
$27-13 = 14$

Answer:

D. 14