Since chlorine only has 17 electrons, the atoms 1+ and 2+ require argon & potassium, that have 18 and 19 electrons, respectively. We require the atoms S- & P-2, which have 16 & 15 electrons respectively, for 1 and 2.
When the number of protons within the nucleus is different from the amount of electrons around that nucleus, an electrical charge is created in the atom of matter. A negative charge is present in an atom if it contains more electrons than protons. A positive charge is present in an atom if there are more protons than electrons.
Ampere-second or Coulomb are the SI units for measuring charge.
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