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l22 - Today Announcements HW#9 is due April 2 at 8:00 am...

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ISP209s8 Lecture 21 -1- Today • Announcements: – HW#9 is due April 2 at 8:00 am – Voting for the Spring Break Story contest is due April 2 at 8:00 am – HW#10 will be due April 9 at 8:00 am Atoms and Nuclei
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ISP209s8 Lecture 21 -2- History ca. Fourth century B.C.: Democritus proposes that matter is made of indivisible units called atoma . 1896: Henri Becquerel discovers radioactivity by chance. 1911: Ernest Rutherford discovers the nucleus. He found something hard and small at the center of atoms
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