Cation ion occur when an atom loses electron whereas anion occur when an atom gains an electron.
NaCl is known as sodium chloride. Sodium loses one electron and chlorine accepts that one electron. On sodium cation ion appears after losing electron whereas, on chlorine anion ion appears due to the accepting of electron.
KBr is known as Potassium bromide. Potassium has one outermost electron o it loses one electron and bromine needs one electron so it accepts that one electron. On potassium cation ion appears after losing electron whereas, on bromine anion ion appears due to the accepting of electron.
CaO is also known as calcium oxide. Calcium has two outermost electron so it loses two electrons which leads to two cations on it while on the other hand, oxygen needs two electron so it accepts that two electrons which causes the appearance of two anion ions.
MgO is known as magnesium oxide. Magnesium has two outermost electron so it loses two electrons which leads to two cations on it while on the other hand, oxygen needs two electron so it accepts that two electrons which causes the appearance of two anion ions on it.
BaCl2 is called barium chloride. Barium has two electrons in its outermost shell so it loses two electrons which leads to the appearance of two cations on it while on the other hand, chlorine needs one electron so two chlorine atoms are needed to accept that two electrons which causes the appearance of two anion ions on chlorine atom.
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