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Chemistry paper 1
Atomic Structure and the Periodic Table
The Nuclear Model
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Nuclear model of atomic structure
Most of an atom is
empty
space, with a
positive
nucleus containing most of the mass, and
negative
electrons at the edge
Nuclear model
Electrons orbit the nucleus at specific distances (
energy
levels/shells)
Positive
charge in nucleus due to protons
Nucleus also contains neutral particles called
neutrons
Radius of an atom is around
0.1
nanometer
Radius of the nucleus is approximately
1
*
10
^-14 m
Nearly all the mass of the atom is found in the
nucleus
Relative charge
Charge of one particle
compared
to another particle
Relative charge of particles
Protons: +
1
Neutrons:
0
Electrons:
-1
Atoms have no overall charge because the number of electrons equals the number of
protons
Relative mass
Mass
of one particle compared to another particle
Relative mass of particles
Protons:
1
Neutrons:
1
Electrons: much smaller than
1