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Atoms & Elements
Term | Definition |
---|---|
Electron | Particle with a negative electric charge |
Nucleus | The center of atom, which contains most of the atom's mass. |
Proton | A positively charged particle inside the atoms nucleus. |
Neutron | A particle with no electrical charge. |
Electron cloud | An area where electrons travel around the atoms nucleus. |
Atomic number | The number of protons in the atoms of an element. |
Average Atomic Mass | The mass of the protons and neutrons of an elements. |
Reactant | An original substance at the beginning of a chemical reaction. |
Product | The new substance produced in a chemical reaction. |
Exothermic reaction | A chemical reaction that releases energy. |
Endothermic reaction | A chemical reaction that absorbs energy. |
Rate of Reaction | The measure of how fast a chemical reaction occurs. |
Law of Conservation of Matter | A physical law that states that matter may change form but it cannot be created or destroyed. |
Element | A pure substance that can not be broken down into simpler substances. |