| A | B |
|---|
| atom | building blocks of matter/the smallest unit of an element that has all the same chemical characteristics and properties of that element |
| matter | anything that takes up space and has volume |
| element | a pure substance; it is made of only one type of atom. All of these atoms have the same number of protons in the nucleus |
| electron "shell" | a cloud around the nucleus of an atom in which the electrons "fly" |
| electron | particles that fly in a cloud around the nucleus of an atom; electrons are negatively charged |
| nucleus | the center of the atom which contains the protons and neutrons |
| atomic number | how many protons an atom of an element has/this determines which element it is |
| atomic mass | the sum of the protons and neutrons found in the nucleus of an atom/this is the "weight" of an atom |
| proton | the particle found in the nucleus of an atom/ these particles have a positive electrical charge |
| neutron | the particle found in the nucleus of an atom/these particles do not have an electical charge |
| periodic table | the arrangement of all the elements known/this chart gives scientists basic information about the elements so it can be easily found |
| property | a trait that something has |
| model | a representation of something |
