Colder air is more dense than warmer air. Clouds can be formed that will lead to rain and thunderstorm formation along the cold front.
In your own words explain what occurs if cold air is more dense than warm air.

wher is the rest of the question

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.