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9th CBSE
IMPORTANT
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Atomic number of chlorine is 17. What will be the atomic number of chloride ion Cl-?

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Important Questions on Structure of Atom

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9th CBSE
IMPORTANT
What do you mean by valence electrons?
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9th CBSE
IMPORTANT
What is the maximum number of electrons that can be present in M shell of an atom?
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9th CBSE
IMPORTANT
How do we find the age of fossils i.e, the sample of woods or dead animals?
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9th CBSE
IMPORTANT
If an element has 5 electrons in the outermost M shell, what element is this?
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9th CBSE
IMPORTANT
Covalency is the number of electrons:
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9th CBSE
IMPORTANT
Why helium does not take part in chemical reaction?