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chemistry
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 charged; protons are positively charged; the numbers of protons and electrons in a material determine the charge of the material. |
Proton, p+ | A positively-charged subatomic particle of the nucleus of an atom that contributes to the mass of the atom. |
Neutron, n0 | 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. |