1. Chemistry Do Now 3-11-19 Complete the isotope chart using your periodic table of elements.
Atomic #
Atomic Mass
#protons
#neutrons
Nitrogen-15
Oxygen-18
Chlorine-37

2. Chemistry Do Now 3-11-19 Complete the isotope chart using your periodic table of elements. Key
Atomic #
Atomic Mass
#protons
#neutrons
Nitrogen-15 7 
15   7 8 
Oxygen-18  8
 18
 10
Chlorine-37
 17
 37
 20

3. Objective(s)
Objective #1: Students will demonstrate mastery of unit 1 by completing the unit 1 assessment and will establish baseline data by completing the unit 2 pre-assessment.
Objective #2: Students will know how atoms of different masses can be the same element by learning the definition of an isotope, completing a P.O.G.I.L. on isotopes, performing a matching activity and answering exit ticket questions.
Mastery Level: 67% (4/6) or better on the Introduction to Isotopes and Isotope P.O.G.I.L. activities

4. Reminders
This Friday, March 15, 2019 schools are closed for teacher professional development.

5. Essential Question: How do atoms of the same element differ?
A quick review
of Friday’s lesson.
Isotopes
Essential Question: How do atoms of the same element differ?

6. What is an Isotope?
Isotopes are atoms of the same element that have the same number of protons but a different number of neutrons.
All elements consist of naturally occurring isotopes and artificially produced isotopes

7. How are isotopes of an element similar? How are they different?
The isotopes of an element have:
Identical Chemical Properties (this is because they have the same numbers of protons and electrons and subatomic particles are responsible for chemical behavior)
Different Physical Properties (different mass and different number of neutrons)

8. How do we represent specific isotopes?
Nuclear symbols are used to represent specific isotopes
To write a nuclear symbol:
1.) the symbol of the element is written first
2.) the mass number is written as a
superscript to the left of the symbol
3.) the atomic number is written as a
subscript to the left. Study the illustration below
Li-7 isotope

9. Complete the isotope worksheet