Intro%20to%20Chemistry

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Intro to Chemistry
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What are we made of?

• Everything is made of matter
• Elements make up everything
• Elements are organized on the Periodic Table
• Elements cannot be broken down in any simpler
  substances
• They are made of atoms

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What is an atom?

• Smaller unit of matter!
• Everything is made of atoms.

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Parts of an atom
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Nucleus the center of the atom

• The nucleus contains
• Protons
  p
• positively charged particles
• Neutrons n0
• particles with no charge
• Electrons
• negatively charged particles e-

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Things to remember

• Number of p
• number of e-

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What makes atoms different?

• the number of protons in nucleus
• the element the number of p in nucleus
• How do we know the number of protons? we look on
  the periodic table!

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How to read element info!
Atomic Number (p)
Element Symbol
Mass Number (p n0)
n0 Mass Number - Atomic number
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So what does it look like?
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Atom Atom

• Two or more atoms molecule
• Element element compound
• All compounds have a formula

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Like a recipe!

• H20
• 2 hydrogen atoms
• 1 oxygen atom
• NaCl
• 1sodium atom
• 1 chlorine atom

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2 important atoms