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Atom, models of the atom, lewis model

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hasanahatesscience's version from 2016-01-07 23:55

Section 1

Question Answer
an atom is the smallest particle of matteratoms contain a nucleus and an outer shell (orbital). atoms contain protons neutrons and electrons
protonshave a POSITIVE CHARGE. in nucleus # of protons = # of electrons. # of protons + # of neutrons = atomic mass
electrons have a negative charge. outside the nucleus. # of e=# of p=neutral atom
neutronshave neutral charge (no charge) located in nucleus . # of pt + # of n= atomic mass
atomic numbernumber provides information about its atomic structure
mass numbertells us the sum of the number of protons and neutrons in an atom. mass # = # of protons + # of neutrons
memorize

Section 2

Question Answer
standard atomic notationrepresents number of subatomic particles.
bohr modelsymbol of element is placed in nucleus. electrons are arranged in orbitals that circle the nucleus.
first shell has 2 electrons2nd and 3rd shell both have 8
bohr rutherford modelnumber of protons and neutrons are shown in nucleus. electrons are arranged in orbitals outside of the nucleus.
lewis modelSHOWS ONLY VALENCE ELECTRONS (OUTER MOST SHELL) recognizes not all electrons participate in chemical bonding. VALENCE ELECTrONS ARE THE ELCTRONS THAT ARE LOCATED IN THE OUTER MOST SHELL
core electronsare located in the inner orbitals. atom with completely filled outer shell is non reactive.
memorize

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