1. Physical Science Atomic Structure Chapter 4

2. Objectives Explain Dalton’s atomic theory
State the charge, mass, and location of each part of an atom according to the modern model of the atom
Compare and contrast Bohr’s model with the modern model of the atom

3. What are atoms?
Atoms are tiny undit that determine the properties of all matter.
John Dalton developed an atomic theory: He believed that atoms could not be divided, however we know today that they can be broken down further into smaller particles.

4. An atom consists of subatomic particles:
An atom is the smallest part of an element that still has the element’s properties
An atom consists of subatomic particles:
Nucleus- an atom’s central region which is made up of protons and neutrons
Proton- a subatomic particle that has a positive charge and that is found in the nucleus of an atom
Neutron- a subatomic particle that has no charge and that is found in the nucleus of the atom
Electron- a subatomic particle that has a negative charge

5. Draw and label the atomic structure!!!

6. Unreacted atoms have no overall charge
Example: Helium
Charge of two protons: +2
Charge of two neutrons:
Charge of two electrons:
Total charge of a helium atom 0

7. Refer to page 106 in text copy date table in the space provided
Particle charge mass (kg) location

8. Electrons An electron’s exact position can not be determined
Electrons exist in energy levels
Each energy level holds a certain number of electrons
Electrons behave like waves

9. Electrons per energy level
Refer to page 108 in text and draw figure 7
Be sure to indicate the energy level and the number of electrons contained in each

10. Orbitals: Refer to orbital presentation

11. The periodic table objectives:
Relate the organization of the periodic table to the arrangement of electrons within an atom
Explain why some atoms gain or lose electrons to form ions
Determine how many protons, neutrons, and electrons, an atom has, given its atomic number and mass number

12. Color your periodic table according to page 113 in text be sure to make a key

13. Refer to the periodic table assignment and atom chart
Know the following terms:
periodic law
period
group/family
ion
atomic number
mass number
isotope
atomic mass unit
average atomic mass