Question

Two isotopes of chlorine have atomic mass 35U and 37U. Should they be placed in separate slots in the periodic table?

Answer 1

no they shouldn't be placed in separate slots because they have the same atomic number and the periodic table is on the basis of atomic number of an element not atmoic mass.
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Answer 2

Answer:

No, they should be placed in the separate slot (or position) because the periodic table is based on the atomic numbers of the elements and nnot the atomic masses..

Also, atomic number is the nnumber of protons in the element.

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