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Chemistry vocab.
2020 8th grade science
| Term | Definition |
|---|---|
| Atom | the smallest particle of an element, made of electrons, protons, and neutrons. |
| Nucleus | the tiny, very dense, positively-charged region in the center of an atom; made up of protons and neutrons |
| Electron Cloud | the area surrounding the nucleus of an atom where the electrons are found |
| Electrical Charge | a property of matter; electrons are negatively charger; protons are positively charged; the numbers of protons and electrons in a material determine the charge of the material |
| Proton | a positively-charged subatomic particle of the nucleus of an atom that contributes to the mass of the atom |
| Neutrons | a subatomic particle of the nucleus of an atom that is without charge that contributes to the mass of an atom |
| Electron | a negatively-charged subatomic particle that orbits the atomic nucleus |
| Subatomic Particles | particles that are smaller than the atom |
| ELement | a pure substance that cannot be separated into simpler substances by physical or chemical means |
| Atomic Number | the number of protons in the nucleus of a single atom |
| Chemical Symbol | a one or two letter notation used to represent an atom of a particular element |
| Atomic Mass | the mass of an atom, approximately equal to the number of protons and neutrons in the atom |
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