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Atoms & Elements

TermDefinition
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.
Created by: BeckScience