| A | B |
|---|
| Physical property | any property used to characterize matter and energy and their interactions |
| Chemical property | a characteristic of a substance that becomes known during a chemical reaction; also, a characteristic depending on the arrangement of the atoms in the molecule |
| Compound | something formed by compounding or combining parts, elements, etc. |
| Molecule | the smallest physical unit of an element or compound, consisting of one or more like atoms in an element and two or more different atoms in a compound |
| Covalent bond | the bond formed by the sharing of a pair of electrons by two atoms |
| Ionic bond | the electrostatic bond between two ions formed through the transfer of one or more electrons |
| Electron | an elementary particle with negative charge |
| Proton | a particle with a positive electrical charge, forming part of the nucleus of an atom |
| Neutron | an elementary particle having no charge |
| Atom | the smallest component of an element having the chemical properties of the element, consisting of a nucleus containing combinations of neutrons and protons and one or more electrons bound to the nucleus by electrical attraction |
| Isotope | one of two or more atoms having the same atomic number but different mass numbers |
| Matter | the substance or substances of which any physical object consists or is composed |
| Nucleus | specialized, usually spherical mass of protoplasm encased in a double membrane, and found in most living eukaryotic cells, directing their growth, metabolism, and reproduction, and functioning in the transmission of genic characters |
| Element | one of a class of substances that cannot be separated into simpler substances by chemical means |
