The The Structure of Structure of

AtomsAtoms

Guess What Fact: This diamond is made

up of one of the most beautiful

materials in the world-diamond.

Diamond is a clear, sparkling crystal

made up only carbon atoms.

Inquiry Launch LabInquiry Launch LabHow can you make different things from the same parts?•Using the given paper clips, toothpicks, and string try to create things that use at least 1 item, but no more than 5 of each kind.Think it Over Questions:1.What do the objects you made have in common? In what ways are they different?2.What effect do you think increasing or decreasing the number of items will have on the identity of the objects you created?

Home LearningHome Learning• Continue to work on ABC Book

Project. Letters A through F due Monday.

• Due Friday of this week Structure of the Atom Review Questions page 219 #1-10.

Part 1 Lecture Part 1 Lecture TopicsTopics**parts of an atomparts of an atom

**size of an atom/scientific size of an atom/scientific

notationnotation

What is an atom?What is an atom?• Atoms are what make up elements• Elements are naturally produced by the

Earth• Periodic Table of Elements is a table that

shows the properties of elements like atomic number, atomic symbol, and atomic mass.

The Parts of an AtomThe Parts of an Atom• According to the Modern Atomic Model,

the atom has a nucleus that holds the protons and neutrons and then has an area space around it called the electron cloud where the electrons orbit in all directions.

• Each subatomic particle has its own charge

Science Use Vs. Common Science Use Vs. Common UseUse

• The Science use of the word Charge is different than its common use

• In science, the word charge means the electrical property of some objects that determines whether the object is positive, negative, or neutral.

• Its common use means to make a purchase with a credit card

Subatomic Particle Subatomic Particle ChargesCharges

• The basic structure of all atoms are the same

• Protons have a positive charge• Neutrons have no charge• Electrons have a negative charge• The atom’s nucleus has a positive charge• The overall charge of the atom is 0 (the

positive charge of the protons cancels out the negative charge of the electron)

Electron CloudElectron Cloud• Electrons are so tiny and move so quickly

that scientists are unable to know their exact location

• This is the cloud of space where electrons are most likely to be moving around in

Electron EnergyElectron Energy• Electrons that move in the parts of the

electron cloud that are closest to the nucleus have MORE ENERGY

• Electrons that move in the parts of the electron cloud that are far away from the nucleus have LESS ENERGY

Class Work: Structure of Atoms Review Questions Part 1 1. Describe the Modern Model of the Atom by drawing and labeling the protons, neutrons, electrons, and electron cloud.2. Explain why the nuclei of atoms always end up with an overall positive charge?3. Why is the exact location of an electron not possible to know? What did scientific research of the atom result in about this?4. What is the relationship that energy shares with electrons?5. Write the mass of each subatomic particle in scientific notationMass of a Proton: 1.007316 gramsMass of a Neutron: 1.008701 gramsMass of an Electron: 0.000549 grams