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  4. 90 K 40 and 20 Ca 40 are known as :

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Q. ${ }_{90} K ^{40}$ and $20 Ca ^{40}$ are known as :

Rajasthan PMTRajasthan PMT 2005

Solution:

${ }_{19} K ^{40}$ and ${ }_{20} Ca ^{40}$ are isobars they have same mass number but different atomic number.