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Catalyst - PowerPoint PPT Presentation

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Catalyst. Finish these sentences: Elements are… I THINK atoms are…. Homework Time. Unit 1 – Atomic Theory and the Periodic Table. Death by Element. Who’s in Charge?. It takes 31 cuts to get to the size of the atom! It is 0.0000007 mm!. Lecture 1.1 – Introduction to the Atom.

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Presentation Transcript

Finish these sentences:

  • Elements are…
  • I THINK atoms are…
today s learning target
Today’s Learning Target

LT 1.1 – I can identify the size, location, and mass of the three subatomic particles found in the atom.

size of the atom
Size of the Atom
  • The atom has a diameter between 0.1 – 0.5 nm
  • Point of reference: A basketball has a diameter of 234,500,000 nm
three types of subatomic particles
Three Types of Subatomic Particles
  • All atoms contain the following subatomic particles:
    • Protons
    • Neutrons
    • Electrons

Protons are found in the nucleus of an atom.

The nucleus is located in the center of the atom.

Protons have a positive charge. We say that their charge is +1


James Chadwick discovered the neutron in 1932!

Neutrons are found in the nucleus of an atom.

Neutrons do not have a charge. They are neutral

mass of protons and neutrons
Mass of Protons and Neutrons
  • Protons and neutrons have the same mass.
  • Each subatomic particle has a mass of 1amu.
    • amu= atomic mass unit

Electrons are found in the electron cloud.

The electron cloud surrounds the nucleus of an atom.

Electrons have a -1 charge

mass of electrons
Mass of Electrons

Electrons have a mass that is 0.00054 amu.

Electrons do not contribute to the weight of an atom.

  • Like the car gear, like water, like switzerland!

To be neutral, the positives and negatives must cancel out!

Neutral Tweet!

Equal nmbr of protons and electrons #Chemswag #Learning #MrAstorIsABoss

The resulting charge is zero!

collaborative station death by element reading
Collaborative Station:Death by Element Reading
  • Complete the reading with your table
  • You must answer all questions
rate yourself
Rate Yourself
  • Based on the exit ticket and your current level of understanding, rate yourself 1 – 4 on LT 1.1
closing time
Closing Time
  • No homework!