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In physics, when a quantity is "quantized," it means that it can be broken down into indivisible units.

Imagine a tower built out of Legos. If you break down that tower, you will find it's made out of 2×4 blocks, which cannot be broken down any further. We say that the tower is quantized, and the quantum unit of the tower is a 2×4 block.

Charge is quantized because all charges are made up of a "building block" of charge. The quantum unit of charge is 1.602 × 10^-19 Coulombs, or 1 e, the charge of an electron/proton.

In nuclear physics, electrons and protons are made up of quarks which have charges of -1/3 e or +2/3 e, so they are truly (at this point), the quantum of charge.

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