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atom

means not able to be divided; smallest particle an element can be divided into and still be the same substance

nucleus

positively charged center that includes protons and neutrons; very, very dense

electron clouds

areas inside of an atom where electrons are likely to be found; the exact path cannot be predicted because they do not travel in exact paths

protons

positive charge; mass is very small at 1.7x10-24
or 1 atomic mass unit, or amu
*INSIDE the nucleus

neutrons

neutral charge; a little larger than a proton but so slight that it's still considered to be 1 amu
*INSIDE the nucleus

electrons

negatively charged
*mass is so small that they are not part of the total mass of the atom

isotope

atoms w/ the same # of protons but different # of neutrons that share the same characteristics as the original element

# of electrons in level 1

2 electrons

# of electrons in level 2

8 electrons

# of electrons in level 3

18 electrons

#of electrons in level 4

32 electrons

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