| A | B |
|---|
| atomic number | The number of protons in the nucleus of an atom |
| covalent bond | A sharing of one or more electrons between atoms or a group of atoms |
| electron | A negatively charged unit of matter that occupies one of the orbitals around the atomic nucleus |
| hydrogen bond | A weak interaction between an atom of a molecule and a neighboring atom that is already taking part in a covalent bond |
| ion | Charged particles resulting from a gain or loss of electrons |
| ionic bond | A transfer of electrons resulting in ions of opposite charge attracting each other and staying together |
| isotope | An element with the same number of protons but a different number of neutrons |
| mass number | The total number of protons and neutrons in an atoms nucleus |
| neutron | A unit of matter, one or more of which occupies the atomic nucleus and with no electric charge |
| proton | Positively charged particle, one or more of which resides in the nucleus of each type of atom |
| chemical bonds | A combination of atoms according to certain rules |
| ionic bond | A chemical bond resulting from a transfer of electrons and the resulting attraction of the positively and negatively charged ions |
| covalent bond | A chemical bond resulting from the sharing of electrons |
| molecule | A union of atoms held together by covalent bonds |
| compound | A substance formed from ionic bonds |
| hydrogen bonds | A weak interaction between the atoms of a molecule and a neighboring atom that is already taking part in a covalent bond |
