Question

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Answer 1

Q. The atomic number of X is 17, predict its

i. Valency

A. 1

Solution:

Electronic configuration; X = 2, 8, 7

Valency = 8 - 7 = 1

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ii. Formula of Hydride

A. HX

Solution:

$H^{+} + X^{-} \longrightarrow HX$

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iii. Type of ion formed

A. Anion

Reason:

Its outermost shell requires to gain 1 electron to complete its octet, this means it has 1 - charge on it.

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iv. Type of compound formed with metals

A. Ionic compound

Reason:

Generally metals lose electrons and non metals gain electrons, here 'X' requires to gain 1 electron hence it a non metal and its reaction with metal will give ionic compound.

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v. Formula of its oxide

A. $X_{2} O$