Question

For the following given elements predict the a) valency; b) period number ; c) group number
Elements:
Na(11) ; Al (13); Cl(17); K(19)

Answer 1

Na:

valency=1

period no.=3

group no.= 1

Al:

valency=3

period no.=3

group no.=3

Cl:

valency=1

period no.=3

group no.=17

K:

valency=1

period no.=4

group no.=1