The Atom

1
The Atom

• CHAPTER 26

2
The Atom

• An Atom is the smallest part of an element which
  has the properties of that element.

3
Structure of the Atom
Sub Atomic Particles

• The atom is made up of three sub-atomic
  particles, the proton the neutron and the
  electron.

Name of particle Situated Relative Mass
Charge Proton Nucleus 1 amu
1 Neutron Nucleus 1 amu
0 Electron Electron cloud 1/1840
-1
4

• The Proton and the Neutron are found in the
  nucleus of the atom and the electrons are located
  in the electron cloud surrounding the nucleus.

The electron is much smaller than the proton or
neutron
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What makes atoms different?

• Each atom is different because each atom has its
  own number of protons in its nucleus.
• The atomic number of an atom is the number of
  Protons in the nucleus of the atom.

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From the information given we can draw an
atom. The atom of aluminium has 13 Protons and
13 electrons(from the atomic number) 27 - 13
14 Neutrons(Mass number - atomic number)
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Draw an atom of Carbon
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Draw an atom of Argon
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Isotopes

• Isotopes are atoms of the same element, which
  have different numbers of neutrons.
• Examples of Isotopes are