An atom ‘A’ has mass number ‘40’ and atomic number ‘18’. An atom ‘B’ has the mass number ‘40’ and atomic number ‘20’ Are A and B isotopes of the same element?
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no...(An isotope is one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behavior but with different atomic masses and physical properties.) they are isobars
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yes
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