Answer
a.
Protons: 12
Neutrons: 12
Electrons: 12
b.
Protons: 12
Neutrons: 12
Electrons: 10
c.
Protons: 27
Neutrons: 32
Electrons: 25
d.
Protons: 27
Neutrons: 32
Electrons: 24
e.
Protons: 27
Neutrons: 32
Electrons: 27
f.
Protons: 34
Neutrons: 46
Electrons: 34
g.
Protons: 34
Neutrons: 45
Electrons: 36
h.
Protons: 28
Neutrons: 35
Electrons: 28
i.
Protons: 28
Neutrons: 31
Electrons: 26
Work Step by Step
We use the following formula to derive the number of neutrons in each case:
Number of neutrons = atomic mass (top number) - atomic number (bottom number)
When the atom is an ion, we add extra or subtract the number of electrons depending on the charge. When the charge is negative, we add extra electrons. Conversely, when the charge is positive, we subtract electrons from the atomic number.
