1. 11/29 A/B Day
LEQ: Why is Potassium (K) more similar to
Beryllium (Be) than it is to Sodium (Na)?
1. What is the difference between an ion
and an isotope?
2. What is a valence electron?
3. What is seafloor spreading?
4. At what type of boundary do we find rift
valleys?
5. What is pangaea?

2. Today’s LEQ: Why is Potassium (K) more
similar to Beryllium (Be) than it is to
Sodium (Na)??
By the end of today, you should be able to…
1. Explain why some elements are more reactive
than others
2. Predict the activity of valence electrons
3. Predict elements that will likely react with each
other

3. Focus Vocabulary
68. Valence Electron
69. Reactivity
70. Compound

4. Activating Strategy: STOP AND JOT
Make a list of 5 traits or characteristics that
you share with members of your family
-your characteristics can be physical
(like your height) OR something about
your personalities
Share Out

5. Ms. Lorant and her brother, Carter 
Things we have in common:
-similar hair color
-both love to read
-both went to the
University of North Carolina
-both athletic
-both love chocolate-
covered pretzels

6. Elements have families too!

7. REMEMBER….
VALENCE ELECTRONS:
ELECTRONS IN THE
OUTERMOST RING

8. Elements in the same GROUP have the
same number of VALENCE ELECTRONS

9. How many valence electrons do I have?
Hydrogen:

10. How many valence electrons do I have?
Lithium:

11. How many valence electrons do I have?
Sodium:

12. Same group = same # of
valence electrons

13. Match each element with an element with
an EQUAL number of valence electrons!
Rubidium (Rb) Bromine (Br)
Fluorine (F) Silicon (Si)
Oxygen (O) Sulfur (S)
Francium (Fr) Chlorine (Cl)
Iodine (I)

14. Hot Q: Which has more valence
electrons: Boron or Neon?

15. Elements with a FULL ring of
electrons are STABLE elements.

16. EOG Exit Ticket
How can a scientist, using the periodic table,
find an element with properties similar to
another element?
a) By comparing density
b) By finding its periodic group
c) By comparing malleability
d) By comparing atomic weight