1. GATOR TIME Get notebook and textbook QUICKLY! Gator Time Options:
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2. Bell Activity Get notebook and textbook.
Answer the bell activity in complete sentences in your notebook:
BA#26 Mixture Review
What is the difference between a homogeneous mixture and heterogeneous mixture?

3. Notebook pg 11 the Amazing Atom
Atom- basic particle from which all elements are made
At the center of an atom is a tiny, dense nucleus containing protons and neutrons.
Surrounding the nucleus is a cloudlike region of moving electrons

4. Composed of subatomic particles- electrons, protons, and neutrons
Electron- very tiny, NEGATIVELY charged particle that moves around the nucleus of an atom
Proton- small, POSITIVELY charged particles found in the nucleus of an atom
NEUTRON- small particle in the nucleus of an atom with NO ELECTRICAL CHARGE

5. # of protons = # of electrons
Protons and neutrons are about equal in mass
Protons and neutrons make up almost ALL the mass of an atom
Electrons are MUCH SMALLER than protons. It takes almost 1,840 electrons to equal the mass of one proton!

6. The models changed over time as scientists learned more about the atom
Atomic Theory-
Grew over a long period of time as a series of models that developed from experimental evidence
The models changed over time as scientists learned more about the atom
Began around 430 BC when Greek philosopher Democritus proposed that matter was made of small pieces that could not be cut into smaller parts (atomos=uncuttable)
1804 John Dalton thought all elements consist of atoms that cannot be divided. He also thought that atoms of the same element are exactly alike.

7. Atomic Theory continued
In 1897 JJ Thompson discovered atoms contain electrons
In 1911 Ernest Rutherford found protons
In 1913 Niels Bhor suggested electrons orbit a nucleus like planets orbit the sun
In the 1920’s, scientists determined that electrons don’t orbit like planets. Instead, electrons move rapidly within a cloudlike region surrounding the nucleus, aka “Cloud Model”
In 1932 James Chadwick discovered neutrons

8. Page 10 Parts of an Atom
Tear out page 318 from your textbook.
Read and make at least 3 annotations.
Complete Figure 3.