Question

(iii) name the element which is a non-metal with ' valency three. Reason

Answer 1

The six commonly recognised metalloids are boron, silicon, germanium, arsenic, antimony, and tellurium. Five elements are less frequently so classified: carbon, aluminium, selenium, polonium, and astatine.” Incidentally, true nonmetalnitrogen also has a +3 charge/valencyand can also form NF3

Answer 2

Metals are electropositive i.e. they tend to give away their valence electrons

to obtain the electric configuration like that of a noble gas.

Non-metals, on the other hand, are electronegative i.e. they tend to accept electrons to obtain the electric configuration like that of a noble gas.

Now, for an element with 3 valance electrons, it is easier to give away the 3 electrons rather than having to gain 5 electrons. The element is electropositive and thus a metal, which means there is no non-metal with 3 valance electrons.

Note: Metals can have 1, 2 or 3 valance electrons in its outermost shell. Non-metals can have 5, 6, 7 or eight valance electrons (most cases).

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