Atomic Structure
A positively charged subatomic particle located in the nucleus.
Proton
The mass of an atom equal to the number of protons and neutrons.
Atomic Mass
The ability to be molded under compressive stress.
Malleability
A pure substance containing only one type of atom.
Element
A change when a new substance is formed from the reaction between two or more different substances.
Chemical Change
A subatomic particle that has almost no mass and a negative charge.
Electron
The number of protons in the atoms of a particular element that is unique only to that element.
Atomic Number
Found on the right side of the periodic table, these elements are poor conductors of electricity and are mostly gases.
Nonmetals
A chemical substance made up of two or more kinds of atoms bonded together.
Compound
A change that does not create a new substance.
Physical change
A neutral subatomic particle located in the nucleus.
Neutron
The number of negatively charged particles in the most outer shell.
Valence Electrons
A physical property that describes how a substance reflects light.
Luster
A number written preceding a chemical formula indicating the number of molecules.
Coefficient
Found in a small diagonal section of the periodic table.
Metalloids
The center of an atom that contains the proton and neutrons and has a positive charge.
Nucleus
Columns of elements on the periodic table that share similar physical and chemical properties
Groups
Found on the left side of the periodic table, these elements have high luster, are usually solid, and conduct electricity.
Metals
A set of symbols and numbers representing the number and type of elements in a compound.
Chemical formula
The tendency of an element to have a reaction with other elements to produce compounds; determined by the number of valence electrons.
Reactivity
A collection of orbitals around the nucleus, each having its own energy level.
Electron Shells
Rows of elements on the periodic table
Periods
What is the ability of an element to transfer heat or electricity through it?
Conductivity
A number written slightly smaller, below, and after an element's symbol indicating the number of atoms in a compound.
Subscript
The principle that states the mass of the substances before a reaction is equal to the mass of the substances after the reaction.
The Law of Conservation of Mass