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# Catalyst - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about 'Catalyst' - jerom

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Presentation Transcript

Finish these sentences:

• Elements are…

• I THINK atoms are…

Death by Element

Today’s Learning Target 0.0000007 mm!

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

Size of the Atom 0.0000007 mm!

• 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 0.0000007 mm!

• All atoms contain the following subatomic particles:

• Protons

• Neutrons

• Electrons

Protons 0.0000007 mm!

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

Neutrons 0.0000007 mm!

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 0.0000007 mm!

• Protons and neutrons have the same mass.

• Each subatomic particle has a mass of 1amu.

• amu= atomic mass unit

Electrons 0.0000007 mm!

Electrons are found in the electron cloud.

The electron cloud surrounds the nucleus of an atom.

Electrons have a -1 charge

Mass of Electrons 0.0000007 mm!

Electrons have a mass that is 0.00054 amu.

Electrons do not contribute to the weight of an atom.

Neutral 0.0000007 mm!

• 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!

summarize 0.0000007 mm!

Collaborative Station: 0.0000007 mm!Death by Element Reading