Question

On the periodic table, the elements in the columns have the same number of —

a)protons in their outer shells.
b)electrons in their outer shells.
c)neutrons.
d)electrons.

Answer 1

· Periodic table, in full periodic table of the elements, in chemistry, the organized array of all the chemical elements in order of increasing atomic number —i.e., the total number of protons in the atomic nucleus. When the chemical elements are thus arranged, there is a recurring pattern called the “periodic law” in their properties, in which elements in the same column (group) have similar properties.

its d btw