Answer» - Electronic configuration of Al is [Ne] 3s2 3p1,14Si is [Ne] 3s2 3p2 and that of 15P is [Ne] 3s2 3p3.
- Metals are characterized by the ability to form compounds by loss of valence electrons.
- ‘Al’ has 3 valence electrons, thus shows tendency to lose 3 valence electrons to complete its octet. Hence, Al is a metal.
- Nonmetals are characterized by the ability to form compounds by gain of valence electrons in valence shell.
- ‘P’ has 5 valence electrons thus, shows tendency to gain 3 electrons to complete its octet. Hence, ‘P’ is a nonmetal.
- Si has four valence electrons, thus it can either lose/gain electrons to complete its octet. Hence, behaves as a metalloid.
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