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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
electrons negatively charged particles
nucleus a small dense center that has a positive charge and is surrounded by moving electrons
protons the positively charged particles in the nucleus
neutrons uncharged particles in the nucleus
electron cloud the area around the nucleus in which electrons move
mass number the total number of protons and neutrons in an atom's nucleus
periodic table Menedeleev's arrangement of the elements
chemical symbol an abbreviation for the element's name
average atomic mass the weighted average of the masses of all the naturally occurring isotopes of that element
metals elements that are shiny and conduct heat and electricity well
nonmetals poor conductors of heat and electricity
metalloids elements that have some properties or metals and some properties or nonmetals
group the vertical column of elements
period horizontal row of elements
atomic number the number of protons in an atom's nucleus
Created by: 18phans0918