If an atom of calcium has two dots for its Lewis structure, then it means that this atom has... O 18 electrons
O 2 valence electrons in shell 4
O 2 valence electrons in shell 1
O three shells, only

2 valence electrons in shell 4 is ur ans

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.