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Atoms
Term | Definition |
---|---|
Atom | The smallest particle that exists as an element. |
Proton | A positively charged subatomic particle found in the nucleus of an atom. |
Neutron | A subatomic particle found in the nucleus of an atom. The neutron is electrically neutral, with a mass approximately equal to that of a proton. |
Electron | A negatively charged subatomic particle that has a negligible mass and is found outside the nucleus. |
Ion | An atom or molecule with a net electric charge due to the loss or gain of one or more electrons. |
Compound | A substance formed by the chemical combination of two or more elements in definite proportions and usually having properties different from this of its constituent elements. |
Molecule | A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction. |
Ionic Bond | The transfer of valence electrons between atoms. |
Covalent Bond | The sharing of electron pairs between atoms. |
Isotope | Varieties of the same element that have different mass numbers; their nuclei contain the same number of protons but different number of neutrons. |
Radioactivity | The spontaneous decay of certain unstable atomic nuclei. |