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unit 3 l1 and 2

atom is the smallest particle into which an element can be divided and still be the same element
nucleus a small, dense center that has a positive charge and is surrounded by moving electrons
protons the positively charged particles in the nucleus
electrons the particles in the atoms that are negatively charged
neutrons uncharged particles that the nucleus contains
electron cloud electrons that move within an area around the nucleus
atomic number the number of protons in the nucleus of anatom
mass number the total number of protons and neutrons in an atoms nucleus
periodic table arrangement of the elements
chemical symbol is an abbreviation for the elements name
average atomic mass of an atom is the weighted average of the masses of all the naturally occurring isotopes of that element
metals are elements that are shiny and conduct heat heat and electricity
nonmetals are poor conductors of heat and electricity
metalloids are elements that have some properties of metals and some properties
group verticle column in the periodic table
period horizontal row of elements on the periodic table
Created by: 18potterd0315