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Answer Wiki. The ionic charge of oxygen is -2. You can tell because oxygen is in group number 6, so it has 6 valence electrons. Since it needs 2 more electrons to become neutral with a full outer shell of 8 electrons, its charge is -2 (since adding electrons gives a negative charge).
What is the electrical charge of a hydrogen atom? All atoms have no charge. Their charge is zero. Theyâre charge-neutral. There is exactly the same number of electrons and protons in an atom. Electrons have a charge of â[math]-e[/math]â and protons a charge of â[math]e[/math]â, where [math]e[/math] is the elementary charge and is [math]1.60217662 Ã 10^{-19}[/math] coulombs. So their charges cancel out.