middle school science 31. illustrate the position of the earth, moon, and sun during a lunar eclipse. you may do so by typing a written description or by drawing and labeling a picture.
2. illustrate the position of the earth, moon, and sun during a solar eclipse. you may do so by typing a written description or by drawing and labeling a picture.

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.

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8