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The electronic configurations of three e...

 The electronic configurations of three elements X, Y and Z are X 2, 8, Y-2, 8, 7 and Z- 2, 8, 2. Which of the following is correct?

A

X is a metal

B

Y is a metal

C

Z is a non-metal

D

Y is a non-metal and Z is a metal

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The correct Answer is:
D
Atomic number of X is 10, this means this is Ne (Neon) which is an inert gas.
Atomic number of given element Y is 2 + 8 + 7 = 17. This means it is chlorine (CI), which is a non metal. Atomic number of given element Z is 2 + 8 + 2 = 12. This means it is Magnesium (Mg), which is a metal.
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