question_answer

A brief information about elements W, X, Y and Z is given below:

W : It has two electron shells both of which are completely filled.

X : It has three electron shells in total and there are four electrons in the valence shell.

Y : It has three electron shells in total and first and third shell have two electrons each.

Z : It has twice as many electrons in its second shell as in its first shell and second shell is the valence shell.

Identify W, X, Y and Z.

A)

W	X	Y	Z
B	Al	N	Ne

               

B)

W	X	Y	Z
Li	K	Ca	Si

               

C)

W	X	Y	Z
Ne	Si	Mg	C

               

D)

W	X	Y	Z
Na	Al	Si	Ne