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For example, FeSO 4 is named iron(2+) sulfate (with the 2+ charge on the Fe2+ ions balancing the 2â charge on the sulfate ion), whereas Fe 2 (SO 4) 3 is named iron(3+) sulfate (because the two iron ions in each formula unit each have a charge of 3+, to balance the 2â on each of the three sulfate ions).
there are two kinds of charge, positive and negative. like charges repel, unlike charges attract. positive charge comes from having more protons than electrons; negative charge comes from having more electrons than protons. charge is quantized, meaning that charge comes in integer multiples of the elementary charge e. charge is conserved.