Houjun Liu


an atom is said to be charged when there is an imbalance between its number of protons and electrons.

additional information

units of charge

charge is measured in SI unit \(C\), coulomb. However, we are often dealing with \(e\), the charge of an electron (as ultimate that’s the principle way by which charge moves around). \(e \approx 1.6 \times 10^{-19} C\).

net charge can be neither created nor destroyed

Unsurprisingly, though you can move electrons around, they will be conserved across a system.