Matter
Anything that has mass and takes up space
Electron
A subatomic particle that has a negative charge
Nucleus
The central core of the atom consisting of protons and neutrons
Particle
small portion of matter
Compound
A substance made up of atoms of two or more different elements joined by chemical bonds
Molecule
smallest unit of most compounds
Solid
a state of matter in which particles are packed close together and fixed in place
liquid
a state of matter in which particles are loosely packed and can move
gas
a state of matter in which particles have space between them and are in motion
plasma
a state of matter in which gas is energized until some electrons break free from atoms
Element
a substance composed of many atoms of the same type .
elements
cannot be broken down by chemical reactions.
volume
the amount of space occupied by a solid liquid or gas
density
distribution of particles in a substance ; mass/volume
mass
the amount of matter in an object
chemical reaction
chemical change that occurs when substances are combined
Law of Conservation of Mass
Matter is neither created nor destroyed
composition
the ratio of elements in a substance
periodic table
A table that shows the elements, their atomic number, symbol, and average atomic mass; elements with similar chemical properties are grouped together.
period
A horizontal row of elements in the periodic table with similar properties
atom
Smallest particle of an element
Proton
A subatomic particle that has a positive charge and that is found in the nucleus of an atom
groups/families
Vertical column on periodic table