Question

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Answer 1

Answer:

1)valency of A=-3

valency of B=0

valency of C=+3

valency of D=0

valency of E=+1

2)E

3)A

4)B,D

Explanation:

1)A=first one we must see the atomic number and do the electronic configuration and by seeing the number of valence electrons we can find the valency

B= if the number of electrons at the valence shell is 8,the atom is stable so it doesn't have valency so it's valency is 0.

C=by the number of electrons we can do the electronic configuration and we can get to know. the valency

D) if the number of electrons at the valence shell is 8 ,the atom is stable so it's valency is 0

E) we know the electronic configuration so we can find the valency

2)if the number of electrons in the valence shell is less than 4

then it is a metal

3)if the number of electrons in the valence shell is more than 4

then it is a non metal

4) if the number of electrons at the valence shell is 8

then it is a noble gas