Consider the following elements and their electronic configurations
X = 2, 8, 7
Y = 2, 8, 3
Z = 2, 8, 5
Now, choose the correct option.

Only Z is a metal

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Only X is a metal

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Y is a metal but Z is a non-metal

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X is a non-metal but Z is a metal

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Solution

The correct option is C Y is a metal but Z is a non-metal
The elements X and Z will gain one and three electrons respectively to complete their octet and therefore, they are non-metals. However, element Y will attain noble gas configuration by losing its three valence electrons and is therefore, a metal.
Hence, the correct answer is option (c).

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Consider the following elements and their electronic configurations X = 2, 8, 7 Y = 2, 8, 3 Z = 2, 8, 5 Now, choose the correct option.

Consider the following elements and their electronic configurations
X = 2, 8, 7
Y = 2, 8, 3
Z = 2, 8, 5
Now, choose the correct option.