ATOM Smallest particle of an element with all its properties.

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ATOM Smallest particle of an element with all its properties

Transcript of ATOM Smallest particle of an element with all its properties.

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ATOM

Smallest particle of an element with all its

properties

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Periodic Table

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H

ATOMIC NUMBER

SYMBOL

ATOMIC MASS

1

1.0079

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Three main parts

•+PROTON

+NEUTRON

+ELECTRON

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PARTICLE LOCATION CHARGE MASS

PROTON NUCLEUS POSITIVE

+

1 A.M.U

ELECTRON ELECTRON CLOUD

NEGATIVE

-1/1836 A.M.U

NEUTRON NUCLEUS NONE 1 A.M.U

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Most of an atom is empty space. The nucleus of the atom contans amost all of the mass of the atom. A greatly enlarged atom might look like a marbel (the nuceus)insde an empty football stadium .

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TO FIND # OF PROTONS

•ATOMIC NUMBER = NUMBER OF PROTONS

• NUMBER OF PROTONS = NUMBER OF ELECTRONS

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NEUTRON• Atomic mass (rounded off)

-subtract

ATOMIC NUMBER

_____________________

NUMBER OF NEUTRONS

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ISOTOPE• ATOMS OF THE SAME

ELEMENT WITH THE SAME NUMBER OF PROTONS/ELECTRONS BUT A DIFFERENT # OF NEUTRONS

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CARBON ISOTOPE• HOW MANY

PROTONS, ELECTRONS AND NEUTRONS

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• HOW MANY PROTONS, ELECTRONS NEUTRONS

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COMPARE THE TWO CARBONS

1. HOW DOES THE MASS COMPARE

2. HOW DO THE PROTONS COMPARE

3. HOW DO THE NEUTRONS COMPARE

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BORON• PROTONS=• ELECTRONS=• NEUTRONS=

ATOMIC NUMBER=ATOMIC MASS=

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DEMOCRITUS

• 440 B.C

• DEVELOPED THE FIRST ATOMIC THEORY

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DALTON THEORY• 1802

• ATOMS CANNOT BE BROKEN INTO SMALLER PIECES

• IN ANY ELEMENT, ATOMS ARE EXACTLY ALIKE

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ATOMS OF TWO OR MORE ELEMENTS CAN COMBINE TO FORM COMPOUNDS

ATOMS OF EACH ELEMENT HAVE A UNIQUE MASS

MASSES OF THE ELEMENTS IN A COMPOUNDS ARE ALWAYS CONSTANT RATIO