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Slide 1

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Learning Intentions
·Be able to describe the structure of the atom
·Be able to state the relative charges and relative mass of a
proton, electron and neutron.
·Understand the meaning to the terms atomic number and
mass number.
·Understand electrons are contained within electron shells.
·Be able to draw the electronic structure of an atom using dot
and cross diagrams
·Be able to describe an isotope.…read more

Slide 2

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Bohr's Atom
electrons in
orbits
nucleus…read more

Slide 3

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HELIUM ATOM
Shell
proton
N
+ -
+
- N
electron neutron
What do these particles consist of?…read more

Slide 4

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ATOMIC STRUCTURE
Particle Charge Mass
proton + ve charge 1
neutron No charge 1
electron -ve charge 1/1840…read more

Slide 5

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ATOMIC STRUCTURE
4 Mass Number
He
the number of protons and
neutrons in an atom
2 Atomic number
the number of protons in
an atom OR the number of
electrons
number of electrons = number of protons…read more

Slide 6

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ATOMIC STRUCTURE
Electrons are arranged in Energy Levels or
Shells around the nucleus of an atom.
· first shell a maximum of 2 electrons
· second shell a maximum of 8 electrons
· third shell a maximum of 8 electrons…read more

Slide 7

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