Question

Of the elements magnesium, calcium, and barium, which forms the ion with the largest radius? the smallest? what periodic trend explains this?

Answer 1

Barium forms the ion with the largest radius, and magnesium forms the one with the smallest radius, as size increases down a group on the periodic table.

Step-by-step explanation:

The element barium forms the ion with the largest radius, while magnesium forms the ion with the smallest radius among magnesium, calcium, and barium. This is explained by the periodic trend that states atomic and ionic size increases down a group on the periodic table, as each element has more electron shells.

Answer 2

Atom radius is made of the electron which was orbiting around the outer part of the atom. The radius of the ion should be influenced by the number of the electron.
in the periodic table, the electron will be increased as the atoms move right and down. That means the highest radius ion should have the most right-down position in the periodic table.
Barium will have the largest radius since it located in the most bottom and magnesium would be the smallest radius.