Which of the following is not true about the halogens?
All of them have seven electrons in their outershell
They either gain an electron by forming an ionic bond or form a covalent compound by electron sharing
All exhibit variable valency
All form diatomic molecules

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

All exhibit variable valency

All of them have seven electrons in their outershell

All form diatomic molecules

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Solution

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Fluorine does not exhibit variable valency because it does not have vacant d orbitals.

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Fluorine does not exhibit variable valency because it does not have vacant d orbitals.

Which of the following is not true about the halogens?
All of them have seven electrons in their outershell
They either gain an electron by forming an ionic bond or form a covalent compound by electron sharing
All exhibit variable valency
All form diatomic molecules