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1st Six Weeks

Vocabulary for atomic structures and properties

Element A substance that cannot be broken down into any other substances by chemical or physical means.
Atom The smallest particle of an element.
Nucleus The central core of an atom containing protons and usually neutrons.
Proton A small, positively charged particle in the nucleus of an atom.
Neutron Small, uncharged particle in the nucleus of an atom.
Electron A tiny, negatively charged, high-energy particle that moves in the space outside the nucleus of an atom.
Atomic Number The number of protons in the nucleus of an atome.
Atomic Mass The average mass of one atom of an element.
Valence Electron The electrons that are farthest away from or most loosely held by the nucleus of an atom and are involved in chemical reactions.
Physical Properties Can be observed without changing the substance into something else.
Chemical Properties Observed when a substance interacts with another substance.
Periodic Table An arrangement of the elements in order of atomic number, in which elements with similar properties are grouped in columns.
Group Elements in the same vertical column of the periodic table, also called a family
Period A horizontal row of elements in the periodic table.
Chemical Equation A short, easy way to show a chemical reaction, using symbols instead of words.
Formula A combination of symbols that shows the ratio of the elements in a compound.
Molecule A combination of two or more atoms that are bonded together.
Compound A substance made of two or more elements chemically combined in a set ratio.
Subscript A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound.
Reactant A substance that enters into a chemical reaction.
Product A substance formed as a result of a chemical reaction.
Conservation of Mass The principle stating that matter is neither created nor destroyed during a chemical reaction.
Coefficient A number placed in front of a chemical formula in an equation. It tells you how many atoms or molecules of each reactant and product take part in the reaction.
Created by: chmsdogs