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Russell and Jeff's Evolution of the Atom

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1.

EVOLUTION OF THE ATOM

BY RUSSELL AND JEFF
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2.

ARISTOTLE

400 B.C.
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3.

THOUGHT THERE WAS ONLY FOUR ELEMENTS
Earth, Wind, Fire, Water

4.

DEMOCRITUS

AROUND 490 B.C.
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5.

THOUGHT EVERYTHING WAS MADE OF ATOMS
His model is the building block to what we use today

6.

John Dalton

1803
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7.

DESCRIBES EVERYTHING IS MADE OF ATOMS
He said atoms cannot be broken or split

8.

J.J. THOMSON

1840
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9.

DISCOVERED ELECTRONS
Drew what atom looked like with electrons

10.

ERNEST RUTHERFORD

1911
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11.

KNEW ATOMS HAD POSITIVE AND NEGATIVE CHARGE
He was the first man to deliberately transmute (transform) an element into another element

12.

NIELS BOHR

1912
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13.

CREATED THE BOHR MODEL
Thought electrons travel outside an atom in a cloud form

14.

DMITRI MENDELEEV

1869
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15.

CREATED PERIODIC TABLE OF ELEMENTS
Left empty space for more elements in periodic table of elements

16.

HENRY MOSLEY

1915
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17.

SUGGESTED USE OF ATOMIC NUMOER INSTED OF ATOMIC WEIGHT

Jeffrey Carty