How do you determine the number of shells an element has

The number of shells in an element can be determined by the number of an electrons an element has.

The first shell can hold 2 electrons

The second holds 8

The third holds 18 & so on

To see how many shells there are place each electron you have from your given element in a shell,

When a shell fills up move on to the next one...

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .