Helium has 2 protons, 2 neutrons, and 2 electrons.
#1 Helium Protons
- Protons = atomic number
From the periodic table, find the atomic number of helium.
The atomic number of helium is 2. Hence, helium has a total of 2 protons.
#2 Helium Neutrons
- Neutrons = atomic mass – atomic number
The atomic mass of helium is 4.002602, so we’ll take the roundup value as 4. And the atomic number of helium is 2.
Subtract the atomic number (2) from the atomic mass (4). Hence, helium has a total of 4 – 2 = 2 neutrons.
#3 Helium Electrons
- Electrons = atomic number
The atomic number of helium is 2. Hence, helium has a total of 2 electrons.
Next: Lithium Protons Neutrons Electrons
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