Question

the mass number of a chromium atom is 52 and it has 24 protons. how many neutrons does this atom have?
○ 24
○ 28
○ 76
○ 80

Explanation:

Step1: Recall the formula for mass number

The mass number ($A$) of an atom is the sum of the number of protons ($p$) and neutrons ($n$) in its nucleus, i.e., $A = p + n$.

Step2: Rearrange the formula to solve for neutrons

We can rearrange the formula to find the number of neutrons: $n = A - p$.

Step3: Substitute the given values

We know that the mass number $A = 52$ and the number of protons $p = 24$. Substituting these values into the formula, we get $n = 52 - 24$.

Step4: Calculate the result

$52 - 24 = 28$.

Answer:

28