out of the two elements X and Y which has become the atomic radius you reason to justify your answer first excess atomic number 18 and atomic mass 40 second Y has atomic number 20 and atomic mass 40

out of the two elements X and Y which has become the atomic radius you

1.	out of the two elements X and Y which has become the atomic radius you reason to justify your answer first excess atomic number 18 and atomic mass 40 second Y has atomic number 20 and atomic mass 40
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