Which of the following is not true about the halogens?

All of them have seven electrons in their outershell

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They either gain an electron by forming an ionic bond or form a covalent compound by electron sharing

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All exhibit variable valency

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All form diatomic molecules

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Solution

The correct option is C All exhibit variable valency
Fluorine does not exhibit variable valency because it does not have vacant d orbitals.

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Which of the following is not true about the halogens?

The correct option is C All exhibit variable valencyFluorine does not exhibit variable valency because it does not have vacant d orbitals.

The correct option is C All exhibit variable valency
Fluorine does not exhibit variable valency because it does not have vacant d orbitals.