chemistry atoms (structure,history)

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10 Terms

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element

made up of only one atom

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mixture

(2 or more) different elements that aren’t chemically joined

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compound

(1 or more) different elements chemically bonded together

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atomic number

number of protons (same as number of electrons)

<p>number of protons (same as number of electrons)</p>
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mass number

protons + neutrons

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J.J THOMPSON

PLUM PUDDING MODEL:

1: no nucleus

2: scattered positive charge

3: no protons/neutrons

4: mass spread evenly throgouht atom

5: no electron shells, atoms have negatively charged electrons embedded within it

<p>PLUM PUDDING MODEL:</p><p>1: no nucleus</p><p>2: scattered positive charge</p><p>3: no protons/neutrons</p><p>4: mass spread evenly throgouht atom</p><p>5: no electron shells, atoms have negatively charged electrons embedded within it</p>
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E.RUTHERFORD

NUCLEAR MODEL:

1: electrons in shells

2: positive charge in nucleus

3: mass in nucleus

<p>NUCLEAR MODEL:</p><p>1: electrons in shells</p><p>2: positive charge in nucleus </p><p>3: mass in nucleus</p>
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JOHN DALTON

SOLID SPHERE MODEL

1803

1st SCIENTIST TO EXPLAIN ATOMS

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NIELS BOHR

PLANETARY MODEL

1913

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ERWIN S.

QUANTUM MODEL

1926

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