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9th CBSE
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What are isobars?
(a)Atoms of same elements.
(b)Atomic numbers are same.
(c)Atoms of different elements having different atomic numbers.
(d)Atomic masses taken with average value.

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Important Questions on Structure of 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 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
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Why helium does not take part in chemical reaction?

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9th CBSE
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What are Radioisotopes?

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9th CBSE
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Three isotopes of oxygen are known with the mass number and . How do they differ from each other in the terms of electron, proton and neutrons?

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9th CBSE
IMPORTANT
How are positive ions formed?

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9th CBSE
IMPORTANT
If an atom contains one electron and one proton, will it carry any charge or not?
