In Dmirti Mendeleveev's periodic table, elements were placed in order of which of the following? a. decreasing atomic mass
b. decreasing atomic number
c. increasing atomic number
d. increasing atomic mass

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

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