Here are some tips on memorization in general.
1. The more senses you use, the better. So, speak what you need to memorize; write what you need to memorize and finally look at it in visual form if possible.
2. One of the best way to memorize is to break up the memorization into small amounts time, rather than all at once. Make flash cards and throughout the day try to memorize. Consistency is key.
3. Another good point is to make up a story or something and associate it with the thing that you need to remember. For example, covalent bonds take place when two atoms share an elections. So, you might want to say something like - - - Covalent sounds like convent and people live together in a convent and they share things. So, covalent bonding takes place when atoms share an electron. I bet you will this this example is stupid, but I also bet you now know it!
See graphic displays of these definitions, and more, at the link below. The important concepts in the definitions are highlighted to help you remember:
Atomic Mass - The weight of an atom.
Atomic Number - The number of protons in an atom.
Compound - A mixture of elements.
Covalent Bond - Occurs when atoms share electrons.
Hydrogen Bond - Occurs in a compound when a hydrogen atom, under the influence of a covalent bond, becomes slightly positive, which then attracts the negative portion of another atom or compound.
Ion - An atom or compound with a positive or negative (not neutral) electric charge
Ionic Bond - Occurs when atoms transfer electrons, resulting in the creation of oppositely charged ions which attract each other.
Matter - Anything composed of atoms.
Molecule - The smallest amount of a compound.
Neutron - A neutrally charged subatomic particle found in the nucleus of an atom. Similar in mass and volume to a proton.
Isotope - A variant of an element containing more or less neutrons than the number of neutrons found in the standard element.