Question

why do isotopes show identical chemical properties ?

Answer 1

heya friend..
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here is your answer..
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they have different numbers of neutrons, which affects the mass number. Mass number determines the physical properties such as boiling/melting/density etc. They have similar chemical properties because isotopes of an element have the same number of electrons as an atom of that element.
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Answer 2

HEY DUDE HERE IS YOUR ANSWER

Bcz isotopes have same atomic number but different atomic mass number
chemical properties are determined by the atomic number
here isotopes have same atomic number
So isotopes show Identical chemical properties
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