Mandeleev saw trends in the physical and chemical properties of elements when he organized them by

yes it is balanced

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.

d) a person who learns about the world by observing it.

explanation:

scientist are people who discover why and how things are done and made in the world.