There are 18 groups in the standard periodic table. These groups are arranged vertically.

Elements in the same group behave similarly because they have the same number of electrons in its outermost shell.

Group 1 has one electron, group 2 has two, ect. However, most Transition Metals in groups 3 through 13 have two electrons.

Group 1- Alkali Metals (Lithium Family)

Group 2- Alkali Earth Metals (beryllium family)

Group 3- Scandium

Group 4- Titanium

Group 5- Vanadium

Group 6- Chromium

Group 7- Manganese

Group 8- Iron

Group 9- Cobalt

Group 10- Nickel

Group 11- Copper

Group 12- Zinc

Group 13- Boron

Group 14- Carbon

Group 15- Nitrogen

Group 16- oxygen

Group 17- Halogens

Group 18- Nobel Gases

Actinides group

A group of playing cards is a deck of cards.

A group of dolphins is called a pod. If that is your question.

An organic acid with a COOH group is called a carboxylic acid.