Matter
anything that has mass and takes up space
Atom
the smallest unit of an element that maintains the chemical properties of that element
Element
a pure substance made of only one kind of atom that cannot be broken down any further without breaking the atoms themselves
Molecule
Two or more atoms held together by covalent bonds
Compound
two or more different elements that are chemically combined to form a new substance
Physical Property
any characteristic of a material that can be observed or measured without changing the composition of the substances in the material
Chemical Property
a characteristic of matter that can be observed as it changes to a different type of matter
Metal
a class of elements characterized by physical properties that include shininess, malleability, ductility, and conductivity
Nonmetal
element that usually is a gas or brittle solid at room temperature, is not malleable or ductile, is a poor conductor of heat and electricity, and typically is not shiny
Metalloid
an element that has properties of both metals and nonmetals.
Boiling Point
the temperature at which a substance changes from a liquid to a gas
Conductivity
the ability of an object to transfer heat or electricity to another object
Reactivity
the ability of a substance to combine chemically with another substance
Periodic Table
an arrangement of the elements in order of their atomic numbers so that elements with similar properties fall in the same column, or group
Density
the amount of matter in a given space; mass per unit volume
Mass
amount of matter in an object
Proton
A subatomic particle that has a positive charge and that is found in the nucleus of an atom
Neutron
A subatomic particle that has no charge and that is found in the nucleus of an atom.
Electron
negatively charged particle; located outside the atomic nucleus
Atomic Mass
the number of protons and neutrons in an atom
Viscosity
the resistance of a liquid to flow
Solubility
the ability of a substance to dissolve in another substance
Atomic Number
The number of protons in the nucleus of an atom.
Chemical Change
a change that occurs when one or more substances change into entirely new substances with different properties