atoms
The smallest unit of an element that maintains the properties of that element
atom
The weighted average of the mass of all naturally occurring isotopes of an element
atomic mass
A subatomic particle that has a negative charge
electrons
The number of protons and the nucleus of an atom
atomic number
A substance that cannot be separated, or broken down into simpler substances by chemical means
element
A subatomic particle that has no charge, and that is located in the nucleus of an atom
neutrons
an atoms central region, which is made up of protons and neutrons
nucleus
A subatomic particle that has a positive charge, and that is located in the nucleus of an atom
protons
A substance made up of atoms or eons of two or more different elements, joined by chemical bonds
compound
A group of two or more atoms that form the smallest identifiable unit into which appears substance can be divided, and still retain the same composition and chemical properties of that substance
molecule
A region around the nucleus of an atom where electrons are likely to be found
electron cloud
an arrangement of the elements in order of their atomic numbers such that elements with similar properties fall in the same column or group
periodic table
A 1, 2, or 3 letter abbreviation of the name of an element
chemical symbol
an element that is shiny, and that conducts heat and electricity well
metal
an element that conducts heat and electricity poorly
nonmetal
an element that has property to both metals and nonmetals
metalloid
vertical column of elements in the periodic table
group
A horizontal row of elements in the periodic table
period