THE ATOM. Unit 5 Chemistry Langley. ATOMIC TIMELINE. THE FIRST ATOMIC SCIENTIST. DEMOCRITUS (400 BC) First scientist to hypothesize that all matter was made of small particles Named the small particles atoms Atoms in Greek means indivisible
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O - 17
P __ + Al
15 __ 13
C ___ + N
6 ___ 7
Ra + n ___
88 0 ___
Step 1: How many half lives with the atom go through?
(time you wait)/(half life length) = 57.2/14.3 = 4.00
Amount left = starting amount * (1/2)#half lives
Amount left = (4.0)*(1/2)4.00 = ?????