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Question

Which of the following element needs only one electron to attain noble gas configuration?

A
Sodium
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B
Oxygen
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C
Chlorine
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D
Neon
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Solution

The correct option is C Chlorine
The table given below shows the electronic configuration of given elements and the number of electrons present in their outermost shell. ElementsElectronic configurationElectrons in outermost shellSodium(2,8,1)1Oxygen(2,6)6Chlorine(2,8,7)7Neon(2,8)8
From the table, it is clear that chlorine (Cl) is the element among the given options whose atom needs only one electron to attain noble gas configuration.

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