Chemistry
Grade-9
Easy
Question
Which group of elements have full energy levels and are considered stable?
- Halogens
- Alkaline earth metals
- Alkali metals
- Noble gases
Hint:
Noble gases have eight electron in their valence shell.
The correct answer is: Noble gases
- Halogens have seven electrons in their outermost shell which is one less than fulfilled orbital.
- Alkaline earth metals have two electrons in their outermost shell which is not stable.
- Alkali metals have one electron in their outermost shell which is not stable.
- Noble gases have eight electrons in their outermost shell and are considered stable.
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