Question

which element has: A:- thrice as many electrons in its second shell as in its first shell? B:-a total of three shells,with seven electrons is its valence shell? C:- a total of two shells,with five electrons in its valence shell? D:-the electronic configuration of 2,8,2? E:- three shells, all of which are completely filled with electrons?

Answer 1

A- Carbon
B-Chlorine
C-Nitrogen
D-Magnesium
E-Argon

Answer 2

Hey there man

A) As there is second shell , this means that the first shell is completely filled so we can say that the no. Of electrons in second shell is

2 x 3 = 6

So the total no of electrons are 6+2=8

Hence the element is oxygen

B) 2+8+7 = Chlorine

C) 2+5= Nitrogen

D) Calcium 2,8,8,2

E) Argon

Thank You

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