17.(a) What is the relationship between two elements X and Y whose atomic
numbers are 18 and 20 respectively but their mass numbers remain the
same as 40 ?
hical nronerties same or different? Explain.
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Answer:
Isobars have same atomic mass but different atomic number.
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Answer:
they are isobars. Isobars are two elements whose atomic numbers are different but have similar mass number.
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