Elements are ordered in the periodic table by their

Question

Quizplus · Accepted Answer

The periodic table is ordered by atomic number, which corresponds to the number of protons in the nucleus of an atom. Therefore, option D (atomic number or proton number) is the correct answer. Option A refers to atomic weight, which is not always the same as atomic mass, and does not necessarily correspond to the ordering of elements in the periodic table. Option B refers to electron and proton number, which are not the primary factors used to order elements. Option C refers to atomic number or electron number, but electron number is not the primary factor used to order elements. Option E refers to proton and neutron number, which are not the primary factors used to order elements.

Elements Are Ordered in the Periodic Table by Their