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Types of chemical combinations
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Chemical combinations are broadly classified into two types, ionic and covalent. In an ionic combination, one element loses and another gains electrons to form ions which are oppositely charged and therefore attracted to each other by electrostatic forces. In a covalent combination, the bonding of atoms is accomplished by the sharing of electron pairs between atoms. This sharing of electrons is possible only when the combining atoms have unpaired electrons. Covalent bonding leads to the formation of molecules in which atoms are held together by covalent bonds. On the other hand, in the ionic combination, ions are held together by electrostatic forces to form crystals.
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