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ATOM QUIZ REVIEW
You need to know the five people that we talked about and their contribution the
development of the atom.
Democritus – first person to use the word ATOM
John Dalton – experiments led to everybody agreeing that there are atoms. Came
up with Dalton’s Atomic Theory.
 All elements are composed of atoms. Atoms are indivisible and
indestructible particles. (not true because there are smaller parts within
the atom)
 Atoms of the same element are exactly alike.
 Atoms of different elements are different.
 Compounds are formed by the joining of atoms of two or more elements.
J.J. Thomson – discovered electrons. Plum Pudding model of the atom
Ernest Rutherford – discovered the positively charged nucleus of the atom by
doing the gold foil experiment. He fired positively charged radiation at a sheet of
gold foil. Most went straight through, some bounced straight back.
Bohr – electrons orbited nucleus; protons and neutrons in the nucleus
We then looked at isotopes, which are atoms of the same element that have the
same number of protons but a different number of neutrons.
12.01
C
6
1. CARBON:
C - 12
protons =
C-14
6
protons = 6
electrons = 6
electrons = 6
neutrons = 6
neutrons = 8