1. Atoms and other Building Blocks of Matter by Dr H - W Winter
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2. Atomic Theory An atom is an incredibly small building block of matter.
Atoms are so small that we cannot see them, even with the best microscopes in the world.

3. ATOMS ARE EVERYWHERE Name 3 substances that are made of atoms
But, having said that ………
ATOMS ARE EVERYWHERE
Name 3 substances that are made of atoms

4. How Many Atoms?
Roughly how many atoms do you think there are in a teaspoon of sulfur (about 5g)?
(or about 1023)
There are over 100 different types of atoms.
Each one forms a different chemical element.
These elements are listed in the periodic table.

5. Atoms can now be “seen” using special technology
Image of individual atoms in Mica
(Image courtesy of Veeco Instruments Inc

6. Two Examples of Atoms The Hydrogen Atom The Carbon Atom electron
protons & neutrons
proton
electrons

7. Atoms are made from sub-atomic particles
1. Protons (+ electric charge), p
2. Electrons (– electric charge), e
3. Neutrons (no charge), n
Protons and neutrons have about the same mass.
Electrons have about 2000 times less mass than protons.
Electrical Forces produce an attraction between the electrons and the protons in the nucleus. This is because they are oppositely charged.

8. Table of Sub-Atomic Particles
Name
Mass (mass units)
Charge on Particle
Where found
Symbol
Proton 1 +
Nucleus p+
Electron
1/2000 -
Electron shells e-
Neutron no
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