Question

An element can have atoms with different mass numbers but same chemical properties
and some are also used in the field of medicine in the treatment of diseases?
1 What are such element known as?
ii. Define such element and also write one examples.
UL Which properties are different in thern?
werna fram 20 Hz to 20 KHz. What are the wavelengths of sound in
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Answer 1

hey mate plz proper question