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In developing his periodic table, Mendeleev listed on cards each element's name, atomic mass, and

Aatomic number. c. isotopes.
Belectron configuration. d. properties.

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GLITERLUCKY500

b I think is the answer

Oseni

In developing his periodic table, Mendeleev listed on cards each element's name, atomic mass, and atomic number.

The periodic table is essentially a list of elements in the order of their atomic numbers - starting from the lowest to the highest.  Thus, it is imperative that the atomic number appears on the card of each element as listed by Mendeleev.

The atomic mass of elements is the sum of the protons and neutrons in the nucleus of atoms of elements. It increases from left to right and from top to bottom of the periodic table.

More on the periodic table can be found here: https://brainly.com/question/11155928

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