Bell Ringer9-23-09

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Bell Ringer 9-23-09

• What is the smallest part of a living thing (You
  learned this last year)?

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Chapter 4 Section 1Introduction to Atoms
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Atom

• Atom
• An atom is the smallest building block of matter.
• It is the smallest part of an element.

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Parts of an Atom

• Nucleus
• Protons
• Neutrons
• Electrons

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The Nucleus

• Consists of the protons and neutrons.
• Where most of the mass of the atom is.

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Protons

• Positively charged particles
• of Protons Atomic Number

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Electrons

• Negatively charged particle.
• of Electrons of Protons
• Electrons are located outside of the nucleus on
  energy levels in an area called the electron
  cloud.

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Neutrons

• No charge or neutral
• of Neutrons
• Mass Number Atomic Number

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The Atom
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Periodic Table
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Exit Quiz

1. What is the smallest building block of matter?
2. Name the three subatomic particles in an atom.
3. What is the positively charged particle called?
4. What is the positively charged particle called?
5. What is the particle called that has no charge?