| A | B |
|---|
| Atom | the smallest particle in which and element can be divided and still be the same substance |
| theory | a unifying explination for hypotheses and observations ,supported by testing |
| Electron | Negatively charged particles found in all atoms |
| proton | positively charged particles found in the nucleus of an atom |
| neutron | particles found int he nucleus tat have no charge |
| nucleus | a tiny, extremely dense region found in the cener of the atom that is positively charged |
| atomic number | the number of protons in the nucleus of the atom |
| atomic mass | the sum of the protons and neutrons in the nucleus |
| chemical bonding | the joining of 2 atoms to form new substances |
| chemical bond | the force of attraction that holds two atoms together |
| balence electrons | the electrons found in the outermost energy level of an atom |
| ionic bond | force of attraction between oppositely charged ions |
| ions | charged particles that form duing chemical changes |
| covalent bond | force of attraction between niclei of atmos and electrons shared by atoms |
| molecule | a neutral group of atoms held together by covalent bonds |
| metalic bond | force of attraction between positively charged metal ion and the electrrons in a metal |
