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?

X is a metal

Y is a metal

Z is a non-metal

Y is a non-metal and Z is a metal

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The correct Answer is:

Y is a non-metal because it requires one complete its octate. Z is a has complete octate.

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