Question

if the atomic number of an element is 6 and its mass number is 14, how many neutrons are contained in the nucleus? 6 20 14 8

Explanation:

Step1: Recall the formula for mass number

Mass number ($A$) = Number of protons ($Z$) + Number of neutrons ($N$).

Step2: Identify the values of $A$ and $Z$

Given that the atomic number (which is the number of protons, $Z$) is $6$, and the mass number ($A$) is $14$.

Step3: Solve for the number of neutrons ($N$)

Using the formula $N=A - Z$, substitute $A = 14$ and $Z = 6$. So, $N=14 - 6$.

Answer:

$8$ (the fourth option)