The first 5 elements (in increasing order) that are found in group 18

Today, I will present the first eighteen elements which are Hydrogen, Helium, Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine, Neon, Sodium, Magnesium, Aluminum, Silicon, Phosphorus, Sulfur, Chlorine, and Argon.

First 5: Hydrogen. The first and simplest element on the periodic table.

Helium. a very light colorless element that is one of the six inert gasses.

Lithium. A very soft, light metal.

Beryllium. A very light metal; although it is 3 1/2 times the density of Lithium.

Boron. The fifth element in the periodic table.

Explanation:

6.4 cm (max) - 25 cm (min)