Question

question 5
how many neutrons are present in an atom of hydrogen-3?
○ 1
○ 0
○ 2
○ not enough information

Explanation:

Step1: Recall neutron formula

Neutrons = Mass number - Atomic number.
Hydrogen has atomic number \( Z = 1 \), mass number of hydrogen - 3 is \( A = 3 \).

Step2: Calculate neutrons

Neutrons \( = A - Z = 3 - 1 = 2 \).

Answer:

2 (corresponding to the option with "2")