Atoms bond to form molecules: Two or more atoms may bond with each other to form a molecule. When two hydrogens and an oxygen share electrons via covalent bonds, a water molecule is formed.
I know that this was 6 days ago but you might have to include a picture or write a full sentence in order to get answers.
Energy must be absorbed to for the electron to transfer from
ground state to a much higher energy level. In the same manner, Energy is
emitted when the electron is transferred from a higher energy level to a lower
energy level. Thus,
n=3 to n=5 à
absorb
n=1 to n=3 à
absorb
n=3 to n=2 à
emit
n=2 to n=1 à
emit
Density = mass/volume again, density is the ratio of mass to volume.
