Atomic Theory
the basic particle from which all elements are made; the smallest particle of an element that has the properties of that element
Atom
the number of protons in the nucleus of an atom
Atomic number
an arrangement of the elements showing the repeating pattern of their properties
Periodic Table
a substance made of two or more elements chemically combined in a specific ratio, or proportion
Compound
the way a mineral reflects light from its surface
Luster
a tiny particle that moves around the outside of the nucleus of an atom
Electron
an atom with the same number of protons and a different number of neutrons from other atoms of the same element
Isotope
a one or two letter abbreviation for an element
Chemical symbol
the electrons that are in the highest energy level of an atom and that are involved in chemical bonding
Valence electron
a substance that can conduct electric current under some conditions
Semiconductor
the central core of an atom which contains protons and neutrons
Nucleus
the sum of protons and neutrons in the nucleus of an atom
Mass number
a horizontal row of elements in the periodic table
Period
the ease and speed with which an element combines, or reacts, with other elements and compounds
Reactivity
an explanation that is based on information or data given in a chart, table, graph, or other medium
Interpretation
a small, positively charged particle that is found in the nucleus of an atom
Proton
an idea that has been studied and investigated and is supported by a vast and diverse array of evidence
Theory
elements in the same vertical column of the periodic table; also called a family
Group
a term used to describe material that can be hammered or rolled into flat sheets
Malleable
to move from one person, place, or object to another without changing form
Transfer
a small particle in the nucleus of an atom, with no electrical charge
Neutron
the average mass of all the isotopes of an element
Atomic Mass
a drawing or image of an actual thing
Representation
a term used to describe a material that can be pulled out into a long wire
Ductile