Question

If an element has a mass number of 222 and an atomic number of 86, how

many neutrons does the element have? *
86
136
138
137

Answer 1

136

Step-by-step explanation:

The Mass Number is the combination of the amount of Protons and Neutrons in an element, so if the total mass is 222, and the amount of protons is 86, then you can do 86 + x = 222 to find that x is equal to 136