Today's Objective!

SWBAT to develop a model to describe the composition of an atom.

Why is it important to know about atoms?

​Elements

• ​Elements are substances that cannot be separated into simpler substances

• ​They are the building blocks of ALL other substances

• ​The smallest unit of an element is an atom.

Properties of Elements

• ​Atoms of different elements have a unique set of properties from each other

• ​Atoms of the SAME element will have the SAME properties

• ​The image shows a sample of silver (Ag) and gold (Au), each of which is a different element from each other.

Substances can be different

• ​Some times, even substances made of the same elements can appear different!

• ​However, the atoms of the same element are always the same

• ​Take a look at this diamond and graphite, both of which are made out of the same element, Carbon.

​Atoms make up everything!

• Atoms are responsible for making up ALL matter that exists

• ​Every object you see is made up of a HUGE NUMBER of atoms - think in the trillions!

• The way atoms combine and arrange themselves is what determines the physical properties of substances, like the diamond and graphite.

​*The element neon actually only makes a red light.

​What are Atoms Made of?

​Let's Find Out...

Atoms are made of subatomic particles

• Protons

• Neutrons

• Electrons

Positive Protons! :)

• Located in the center of the atom, called the nucleus

• Protons have a positive electrical charge (+)

• The number of protons determines its number on the Periodic Table

Electrons :(

• Tiny particles that orbit the center of the atom

• Electrons have a negative electrical charge (-)

• Usually, there is an equal amount of electrons as protons

Neutral Neutrons. :|

• Neutrons are located in the center of the atom just like protons

• Neutrons do NOT have an electrical charge (0)

• Similar amount as protons

Assignment: Build an atom

• Open up the Google Slides under today's assignment (10/27)

• Read the instructions to build a Boron atom

• Answer the "Exit Questions" on the last slide.