1. 4.8 Review The Atom

2. 1. Explain the difference between matter and mass.
Anything that has volume and mass
Mass:
The quantity of matter an object has

3. 2. Explain how elements and atoms are related.
Atoms are the smallest part of an element that has all the properties of that element.

4. 3. Who is John Dalton and what are the four main points of his theory.
Discovered that all matter is made up of individual particles called atoms, which cannot be divided
All elements are composed of atoms
All atoms of the same element have the same mass and atoms of different elements have different masses
Compounds contain atoms of more than one element
In a particular compound, atoms of different elements always combine in the same way

5. 4. List what Thomson, Rutherford, and Bohr contributed to the atomic theory.
Particles in the atom have a charge
Rutherford
He proposed the idea of the nucleus
Bohr
Electrons are arranged around the nucleus in energy levels

6. Dalton Thomson Rutherford Bohr

7. 5. Complete the Chart Protons + 1 amu In Nucleus Neutrons = Electrons
Charge
Mass
Location
Protons +
1 amu
In Nucleus
Neutrons =
Electrons -
Negligible
Outside of Nucleus
How are electrons arranged around the nucleus?
Electrons are arranged in Electron Energy Levels outside of the nucleus.

8. 6. Draw a picture of a carbon-12 atom.

9. 7. Draw a picture of a Lithium-7 atom.

10. 8. How many protons does nitrogen always have?
7 a. What about Titanium? 22

11. 9. Complete the following isotope chart.
Carbon - 12
Carbon - 16
Sulfur - 23
Sulfur - 25
# of protons 6 16
# of neutrons 10 7 9
# of electrons

12. Number of Electrons Lost or Gained
10. Ion Practice
Element Name
Ion Symbol
Number or Protons
Number of Electrons
Number of Electrons Lost or Gained
Fluorine F- 9 10
gained one
Potassium
K +1 19 18
lost one
Calcium
Ca+2 20
Lost two
Bromine
Br -1 35 36
Gained one

13. 11. Explain the difference between an ion and an isotope.
Same atomic # and same mass number:
Different number of electrons
Isotope:
Same atomic #; different mass number:
Different number of neutrons

14. 12. Explain how a compound and a molecule are related.
Compound: Pure substance made up of two or more elements Molecule: Smallest part of a compound that still has all of the properties of that compound

15. Section #4 Packet due on Tuesday!
4.9 QUIZ Tomorrow
Any Questions
Section #4 Packet due on Tuesday!