Nitrogen is in many molecules in living things. It is used in fertilizer because plants can't get it out of the air. Oxygen is the part of the air we need to breathe. Fires will not burn without oxygen. Your body is warm because your cells are burning the food you eat with the oxygen you breathe.
Fluorine is the most active element, so it combines with almost anything.
Fluorides in toothpaste strengthen tooth enamel. Neon is an inert gas that glows red in neon tubes. An acid neutralizer is called a base or alkali, so sodium's group is called the alkali metals. Sodium and chlorine make salt. Magnesium is in chlorophyll which makes plants green and enables plants to grow by using sunlight.