electron
a negatively charged subatomic particle moving around the outside of the nucleus of an atom
neutron
a neutral subatomic particle in the nucleus of an atom
compound
two or more elements that combine to make a new substance
element
a pure substance that cannot be broken down into other substances by chemical or physical means
chemistry
the study of what things are made of and how they change
proton
a positively charged subatomic particle in the nucleus of an atom
nucleus
the center of an atom, made up of protons and nuetrons
metalloid
elements on the periodic table that have both properties of metals and nonmetals
nonmetal
nonmetals are dull and they do not conduct heat and electricity
metal
metals are dense, strong and good conductors of heat and electricity
atom
the smallest particle of an element
molecule
a particle made up of two or more atoms bonded together
subscript
in a chemical formula, the number to the lower right on an element symbol indicating the # of atoms of that element
periodic table
elements are grouped by their characteristics on this chart developed by Dmitri Mendleev in 1869 ( its always getting updated though)
mass
a measure of the quantity of MATTER in an object
atomic mass
the total number of protons and nuetrons in the nucleus of an atom
atomic number
the number of protons in the nucleus of an atom
chemical formula
the chemical symbols and numbers indicating the atoms contained in the basic unit of a substance. a shorter easier way to show chemical reactions
chemical bond
the force that hold atoms together
product
during a chemical reaction, this is the substance that is the result of a chemical change
reactant
during a chemical reaction, this is the substance that undergoes a chemical change
chemical change
change in matter that forms one or more new substances
physical change
a change that alters the form or appearance of a material but does not convert the material into a new substance