| A | B |
|---|
| atom | simplest particle of an element that retains all properties of that element |
| atomic number | number of protons in an atom |
| bond | chemical attraction between atoms |
| chemical reaction | process of breaking chemical bonds forming new bonds or both |
| covalent bond | bond formed by sharing of one or more pairs of electrons between atoms |
| electron | negatively charged particle |
| element | substance that ordinarily cannot be broken down chemically to form simpler kinds of matter |
| energy level | area around the nucleus in which electrons move |
| ion | atom or compound with a net electrical charge |
| ionic bond | bond formed by electrical attration between 2 opposing charged ions |
| mass | fundamental property of an object generally regarded as equivalent ot the amount of matter in an object |
| matter | anything that occupies space and has mass |
| molecule | chemical structure composed of 1 or more atoms |
| neutron | neurtally charged particle in the nucleus of an atom |
| nucleus | core of protons and neutrons in an atom |
| proton | subatomic particle with + charge |
| biosphere | the area on and around Earth where life exists |
| biome | a geographic area characterized by specific kids of plants and animals |
| ecosystem | all the biotic and abiotic components of an environment |
| community | the populations in one area |
| population | all the members of a species that live in the same area and make up a breeding group |
| organism | a living thing, made up of and develops from cells |
| organ systems | a group of organs that interact to perform a set of related tasks |
| organs | several types of body tissues that together perform a specific function |
| tissues | in most multicellular organisms, a group of similar cells that carry out a common function |
| cell | a membrane bound structure that is the basic unit of life |
| organelle | one of several formed bodies with a specialized function that is suspended in the cytoplasma and found INSIDE eukaryotic cells |
| macromolecules | a very large molecule composed of many smaller molecules |
