Question

The periodic table is based on an element's A. atomic number. B. molecular mass. C. atomic mass. D. molecular size

Answer 1

Hey dear,

The periodic table is based on an element's atomic number.

So,
OPTION (a) is correct.

PERFECTLY DEFINITELY PURE CORRECT ANSWER.
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Answer 2

heyy dear ur answer.........

According to modern periodic table which is given by moseley..he state that..
    The periodic table is a tabular arrangement of the chemical elements, ordered by their atomic number, electron configuration, and recurring chemical properties, whose adopted structure shows periodic trends.......

so, modern periodic table based on atomic number....i hope it will help u....

       ................@kundan