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2/28          A/B Day
NO LEQ TODAY!
1. What is the difference between a benthos and a
plankton?
2. What is a nekton?
3. Which of the following would you predict to have
salinity—the Atlantic ocean, the Colorado River, or a
polar ice cap?
4. Explain your answer to #3
5. What is one difference between saltwater and
freshwater—other than the salt?
Discovery Education:
Oceans blue with Philippe Cousteau: Atlantic
Let’s Review:
I have 27 protons.
    What am I?
I have 2 electrons
  and NO charge.
    What am I?
I have 46 protons.
What am I?
I have 79 protons.
    What am I?
I have 8 electrons
  and NO charge.
    What am I?
I am calcium (Ca).
    How many
   protons do I
      have?
I am silver (Ag).
   How many
  neutrons do I
     have?
I am neon (Ne).
   How many
  electrons do I
      have?
What am I?
Protons: 5
Neutrons: 6       BORON!
Electrons: 5
How many valence electrons do I have?
Protons: 5
Neutrons: 6          3!
Electrons: 5
What am I??
Protons: 2
Neutrons: 2
                   HELIUM!
Electrons: 2
How many valence electrons do I have?
Protons: 2
Neutrons: 2
                      2!
Electrons: 2
FIND THAT ELEMENT!

GROUP 1, PERIOD 1 =
FIND THAT ELEMENT!

GROUP 6, PERIOD 7 =
FIND THAT ELEMENT!

GROUP 2, PERIOD 5 =
FIND THAT ELEMENT!

GROUP 9, PERIOD 4 =
FIND THAT ELEMENT!


GROUP 17, PERIOD 3 =
FIND THAT ELEMENT!

GROUP 11, PERIOD 4 =
GROUP 17
HALOGENS!
GROUP 18
NOBLE GASES!
Elements in the same
_group/period_ have
similar characteristics!

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2/28/12