Ch 9 Atomic Physics
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Originally what did most cultures believe about matter?
Most cultures believed that matter was infantry divisible.
Who was the first person to question matters divisibility?
Democritus
What was Democritus’s theory? And what was his model?
-His theory was that matter is made of small indivisible particles, he called them “atomos”
What was John Dalton’s field of study? What and when did he study? What did his model look like?
• Dalton was a meteorologist - He studied the behavior of gasses in the early 1800’s
What was Daltons atomic theory?
• An element is made of indivisible, indestructible particles called atoms. • All atoms of the same element are identical with the same properties • All atoms of different elements are different. • Atoms are neither created or distorted in chemical reactions (law of conservation of matter) • Compounds form when atoms of more than one element combine(process called bounding) • In every compound, the relative number of atoms and kinds of atoms will be the same.
What did Joseph Thomson study? What was his theory?
• He was physicist that studied the passage of electricity through a glass tube filled with gas • His theory was that there must me negatively charged particles in atoms (he never found them)
What did Thomson’s model look like?
The plum pudding model