Class Blog 9-17-13

Web Assign is being funky. We will be playing it by ear.

Origami Periodic Table

1. Fold first two columns back against the dashed line (Groups 1 and 2)

2. Fold it again so that the element Be is next to the element B

3. Highlight (in any color) elements Boron, Silicon, Germanium, Arsenic, Antimony, and Tellurium. In the top corner, write yourself a key that explains the highlighted elements as Semimetals or Metalloids.

4. Draw two arrows opposite each other from the black staircase line. Label the one going to the left metals, and the one going to the right nonmetals.

5. At the top of each column, you will label them with numbers. H  column with +1. Be +2. B +3. Skip C. N -3. O -2. F -1. And He with no charge.

6. Tape this into the back or your composition notebook

NOTES   (Look on Moodle for more)

• Dmitri Mendeleev took credit for his organization of elements

- He even left space for undiscovered elements

• The Periodic Table

- Metals

- Malleable

- Shiny

- Conducts heat and electricity

- Nonmetals

- Brittle

- Not shiny

- Does not conduct heat or electricity

- Metalloids

- A combination of metals and nonmetals

• Periods are the rows
• Groups or Families are the columns

-Shares chemical properties

- Main-group Elements are Groups 1, 2, 13, 14, 15, 16, and 17

- Transition Metals are 10 elements in periods 4-6

- Post-Transition Metals are Groups 13, 14, and 15

- Alkali Metals are Group 1

- Alkaline Earth Metals are Group 2

- Halogens are Group 17

- Noble Gases are Group 18

• The Atom

- Protons have a positive charge, are in the center of an atom, and determine the element’s identity. If you change the number of protons, you change the element.

- Neutron has a neutral charge and consists of most of the mass of an atom along with the protons.

- Electron has a negative charge. Circles around the atom.

- Atomic Number is the number of protons in an element.

Hint for ChemThink (homework for tonight)

• Make three headings in your notebook (Atomic Structure, Ions, and Isotopes)

- Take notes on the tutorial

- Answer Q’s but you don’t have to write them down

• More hints

- Protons + Neutrons = mass number

- Protons - Electrons = Neutrons

- mass number is different from atomic mass

- Protons = Atomic Number

- You CANNOT change the protons without changing the element

• Do the two handouts after the ChemThink

Next Scribe is Gemini Plamoottil