what is the charge on an alpha particle?

An alpha particle has a charge of +2e , which equals +3.2×10−19+3.2\times 10^{-19}+3.2×10−19 coulombs.

Quick Scoop

• An alpha particle is the nucleus of a helium atom, made of 2 protons and 2 neutrons.

• Only protons carry charge; neutrons are uncharged, so the total charge comes from the 2 protons.

• Each proton has charge +1.6×10−19+1.6\times 10^{-19}+1.6×10−19 C, so:
  • Total charge =2×1.6×10−19=3.2×10−19=2\times 1.6\times 10^{-19}=3.2\times 10^{-19}=2×1.6×10−19=3.2×10−19 C, positive.

So, in words: the charge on an alpha particle is “plus two elementary charges,” or +3.2×10−19+3.2\times 10^{-19}+3.2×10−19 coulombs.

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