An element X combines with hydrogen to form a compound $X H_{3}$ . The element X is placed on the right side of the periodic table. What is true about the element X?
A. Has valence electrons.
B. Is a metal and is solid.
C. Is a non-metal and is a gas.
D. Has a $5$ valence electrons.
E. $X H_{3}$ reacts with water to form a basic compound.

A, B and C

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B, C and D

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C, D and E

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E, A and B

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Solution

The correct option is C C, D and E
Here, X is nitrogen having atomic number 7 and electronic configuration (2,5). The compound is $N H_{3}$ .
Nitrogen is a non metal as it shows the tendency to accept electrons to complete its octet and is a gas.
Its electronic configuration is (2,5) and so it has 5 valence electrons and valency 3.
The reaction of $N H_{3}$ with water is :
$N H_{3} + H_{2} O \to N H_{4} O H$

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