A horse is running at a speed of 12
meters per second. It takes the horse 3
seconds to come to a stop to drink at a
river. The average force needed to bring
the horse to a stop is 1,800 newtons.
What is the mass of the horse?

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;