1. Unit 3 – Atoms

2. Warm up – CRASH COURSE – THE NUCLEUS Atomic Structure Notes
What is an atom? How do we know they exist?
Agenda:
Warm up – CRASH COURSE – THE NUCLEUS
Atomic Structure Notes
Brain break – POWERS OF TEN
Atomic structure practice
Exit ticket
Homework: Complete practice examples
Objective: Objectives: Students will be able to....
1. Describe the three types of subatomic particles, their charge, and location in an atom.
2. Use an isotope symbol to find the number of protons, neutrons, and electrons in an atom of that element.

3. Warm up:
1. What are the three subatomic particles and their locations in the atoms?
Agenda:
Warm up
Check / Review HW – atomic symbols
Building an atom pHet prelab / lab
Atomic History Video (10 min) ?
Exit ticket 2!
Homework: Atomic structure POGIL
Objective: Be able to identify the type and number of subatomic particles in an atom of a given element and write the appropriate isotope symbol.

4. Warm up: 1. Use the information from the right to determine the number
of protons, neutrons, and electrons in an atom of astatine
2. Is the mass of 1.01 amu on the periodic table the exact mass
of a Hydrogen atom?
Agenda:
Check and review homework
Isotopes notes and average atomic mass notes
Homework: isotopes and average atomic weight practice
EXIT TICKET
Objective: Be able to identify the type and number of subatomic particles in an atom of a given element and write the appropriate isotope symbol.
Be able to calculate the average atomic weight for an element based on the relative abundance of its ions.

5. Average Atomic Weight
Carbon has two naturally occurring isotopes, carbon-12 and carbon-13. The exact mass and
relative abundance of each of these isotopes can be found in the table below. Calculate the average
Atomic weight for carbon.
mass number
exact weight
percent abundance 12
98.90 13
1.10

6. Average Atomic Weight
Carbon has two naturally occurring isotopes, carbon-12 and carbon-13. The exact mass and
relative abundance of each of these isotopes can be found in the table below. Calculate the average
Atomic weight for carbon.
mass number
exact weight
percent abundance 12
98.90 13
1.10
To calculate the average atomic weight:
Convert the percent abundance to a decimal.
Multiply the exact weight of each isotope by its relative abundance.
Add the results together and round off to an appropriate number of decimals
This is the solution for carbon:
( ) (0.9890) + ( ) (0.0110) = amu

7. Warm up:
1. Write the isotope symbol for an atom with 53 protons, 74 neutrons and 54 electrons.
2. Nitrogen-14 is 99.63% abundant and nitrogen-15 is 0.37% abundant. Calculate the average atomic weight.
Agenda:
Check and Review homework
Notes III Drawing Bohr Models and lewis dot diagrams
Exit ticket
Homework: Review ws study for quiz next class
REVIEW UNIT 3 CONCEPTSOBJECTIVES
Students will be able to determine the number of protons, neutrons, and electrons in an atom by using the periodic table or isotope symbols.
When given a model of an atom, students will be able to identify it on the periodic table or write an isotope symbol.
Students will understand how the structure or identity of an atom changes when the number of subatomic particles changes. (atoms vs. isotope vs ion)

8. SUMMARIZER
What is the difference between the isotopes Hydrogen-1 and hydrogen-3? Write their isotope symbols.
What changes to cause a neutral atom to form an ion?
Draw and write the symbol for an atom with 7 protons, 7 neutrons, and 10 electrons.

9. Check study guide – questions Test on atomic structure Homework:
Warm up:
1. Review your study guide! Test in a few minutes.
Agenda:
Check study guide – questions
Test on atomic structure
Homework:
READ AND HIGHLIGHT LAB
Answer prelab questions
Illustrate procedure part A & B in margin