Use the periodic table to find the number of valence electrons for calcium (Ca) aluminum (Al) rubidium (Rb) oxygen (O) sulfur (S) and iodine (I). then use that information to predict the formula for each of the following compounds: Calcium oxide, aluminum iodide, rubidium sulfide, and aluminum oxide.

Calcium (Ca) => 2

Aluminium (Al) => 3

Rubidium (Rb) => 2

Oxygen (O) => 2

Sulphur (S) => 2

Iodine (I) => 1

Formulae

Calcium oxide : CaO

Aluminium iodide : AlI3

Rubidium sulphide : RbS

Aluminium oxide : Al2O3

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.

the answer is 0.42 is that is an option. this question provides no info