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प्रश्न
The electronic configurations of three elements X, Y and Z are:
X: 2
Y: 2, 8, 7
Z: 2, 8, 2
Which of the following is correct regarding these elements?
पर्याय
X is a metal.
Y is a metal.
Z is a non-metal.
Y is a non-metal and Z is a metal.
MCQ
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उत्तर
Y is a non-metal and Z is a metal.
Explanation:
Element Y has 7 valence electrons in its outermost shell, meaning it needs to gain 1 electron to complete its octet, which is a characteristic property of a non-metal. Element Z has 2 valence electrons in its outermost shell, which it can easily lose to achieve stability, making it a metal. Element X has a stable, filled outer shell and represents the unreactive noble gas helium, meaning it is neither a metal nor a reactive non-metal.
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