What was the key characteristic by which dmitri mendeleev arranged his periodic table? a. increasing atomic number b. electron configuration c. decreasing atomic number d. increasing atomic mass

 D. increasing atomic mass

Explanation:  Dmitri Mendeleev  arranged the periodic table on the basis of the increasing atomic mass.

He observed the physical and chemical properties of the elements and he found that these properties are related to their atomic masses. Thus he arranged these elements on the basis of the physical and chemical properties into different kinds of groups.

Thus elements with similar property was arranged in the same group.

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

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