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Two elements X and Y have following elec...

Two elements `X and Y` have following electronic configurations.
`X: 1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 4s^(2)`
`Y: 1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(5)`
The expected compound formed by combination of X and Y will be expresed as

A

`XY_(2)`

B

`X_(5)Y_(2)`

C

`X_(2)Y_(5)`

D

`XY_(5)`

Text Solution

Verified by Experts

The correct Answer is:
A
Valency of element`X` is `2` (electrons in the outermost shell) while that of element `Y` is `1` (electron required in the outermost shell to complete octet). So, the formula of the compound between `X and Y` is `XY_(2)`
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Knowledge Check

  • An element having electronic configuration is 1s^(2) 2s^(2) 2p^(6) 3s^(2) 3P^(6) 4s^(1) will form:

    A
    acidic oxide
    B
    basic oxide
    C
    amphoteric oxide
    D
    neutral oxide

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    a nonmetal
    C
    a noble gas
    D
    a metalloid

  • The element with electronic configuration 1s^(2)2s^(2)2p^(6)3s^(2) is

    A
    member of alkali family
    B
    a noble gas
    C
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    D
    unpredictable.

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