# 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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Catalyst

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### Catalyst

Finish these sentences:

• Elements are…

• I THINK atoms are…

Death by Element

### Who’s in Charge?

It takes 31 cuts to get to the size of the atom! It is 0.0000007 mm!

### 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

• 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

• All atoms contain the following subatomic particles:

• Protons

• Neutrons

• Electrons

### Protons

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

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

• Protons and neutrons have the same mass.

• Each subatomic particle has a mass of 1amu.

• amu= atomic mass unit

### Electrons

Electrons are found in the electron cloud.

The electron cloud surrounds the nucleus of an atom.

Electrons have a -1 charge

### Mass of Electrons

Electrons have a mass that is 0.00054 amu.

Electrons do not contribute to the weight of an atom.

### Neutral

• 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!