Question

the electronic configuration of an element is 2 8 4 predict its valency. ​

Answer 1

The valency of the element is 3

We add all the superscripts to know the number of electrons in an atom. Thus total number of electrons will be 2+8+5 = 15. Valency is defined as the number of electrons gained or lost in order to achieve nearest noble gas configuration

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Answer 2

+4 , +2

it is SILICON.

1s2 , 2s2 , 2p6 , 3s2 , 3p2