Question

question 13
calcium has the atomic number 20. if it has a mass number of 46, how many neutrons are present?
o 46
o 66
o 20
o 26

Explanation:

Step1: Recall the formula

The formula for calculating the number of neutrons is $n = A - Z$, where $A$ is the mass - number and $Z$ is the atomic number.

Step2: Identify given values

Given that $Z = 20$ (atomic number) and $A = 46$ (mass number).

Step3: Calculate the number of neutrons

$n=A - Z=46 - 20 = 26$.

Answer:

D. 26