What elements are found in the shaded area of the periodic table

Explanation:

H. Hydrogen.

Li. Lithium

Na. Sodium.

K. Potassium.

Ru. Rubidium.

Cs. Caesium.

Fr. Francium.

Be. Beryllium.

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.

answer carbon and three oxygen atoms;