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unit 3, lesson 1+2

Atom The smallest particle into which an element can be divided and still be the same element.
Electron Negatively charged particles
Nucleus A small, dense center that has a positive charge and is surrounded by moving electrons.
Proton Positively charged particles
Neutron Uncharged particles
Electron Cloud An area around the nucleus, that electrons move within.
Atomic Number The number of protons in the nucleus of an atom
Mass Number The total number of protons and neutrons in an atoms nucleus.
Periodic Table An arrangement of of elements in order of their atomic numbers such that the elements with similar properties fall in the same column or group.
Chemical Symbol a one,two, or three letter abbreviation of the name of an element.
Average atomic mass the weighted average of the masses of all naturally occurring isotopes of an element
Metal an element that is shiny and that conducts heat and electricity well
Nonmetal an element that conducts heat and electricity poorly
Metalloid an element that has properties of both metals and nonmetals
Group a vertical column of elements in a periodic table, elements in a group share chemical properties.
Period in chemistry, a horizontal row of elements in the periodic table.