A student draws a model of an atom to help him determine how the atom will interact with other atoms. Why is the model helpful? The model is easier to see than an actual atom.
The model accurately represents all properties of the atom.
The model behaves in the same way as an actual atom.
The model shows the properties of the atom that the student needs to know.

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 .

the answer is true. hope it .

the maximum mass of nh3 is nh3 in grams

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