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chapter two vocabulary

atom smallest unit of an element, 3 subatomic particles
proton positive (+) charge, subatomic particle
electron negative (-) charge, subatomic particle
neutron no charge, subatomic particle
nucleus center of an atom
inside a atom protons and electron(+)charge
outside an atom elements float around
element substance that cannot be broken down, most naturally occur (92 out of 112), elements are building blocks of minerals
atomic number tells number of protons and electrons
atomic mass tells how heavy the atom is
to find a neutron atomic mass-atomic number
electron dot diagram electrons located at energy levels, 1st energy level-2 elec.2nd energy level-8 elec.3rd energy level-18 elec. (only for atomic numbers 11+)
group vertical columns
periods horozontal rows
3 states of matter 3 states of matter
solid definate shape and volume
liquid no definate shape, definate volume
gas no definate shape or volume
chemical formula 1. element2. # of molecules3. # of atoms
Created by: maryquinnl2013