Question

What valencies will be shown by elements a,b,c,d and e having atomic numbers 2,4,8,10 and 13 respectively?

Answer 1

Answer:

...

Explanation:

the valencies shown are respectively...

0 for atomic number 2

+2 for atomic number 4

-2 for atomic number 8

0 for atomic number 10

+3 for atomic number 13

Answer 2

Answer:

A will show 0 valence electrons,

B will show +2 valence electrons,

C will show -2 valence electrons,

D will show 0 valence electrons and

E will show +3 valence electrons.

Explanation:

In 'A' element K : 2 due to which it becomes stable so the valency is 0

In 'B' element K : 2 , L : 2 i.e. atomic no. 4 due to which the last shell will remove the 2 electrons to become stable so it will become +2

In 'C' element K : 2, L : 6 i.e. atomic no. 8 so as to become stable it will take -2 more electrons

In 'D' element K : 2,L : 8 i.e. atomic no. 10 which is already balanced so it's valence electrons will be 0

In 'E' element K : 2,L : 8,M : 3 i.e. atomic no. 13 so to become stable it will remove the last 3 electrons. So, the valency becomes +3

HOPE THAT THIS WILL HELP YOU ALL

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