Welcome! Please get out: Your lab notebook Your “Discovering Patterns on the Periodic Table” A writing utensil Ask your partner: “What is your favorite thing about the new school?” Welcome!

Warm up Answer #12 then compare you answers to number 11-12 with your partner. Which atom did you think would be bigger in size? After looking at the cards you see that sodium has an atomic radius of 0.19 and chlorine has a radius of 0.10 Now try and answer #13a/b on “Discovering the Patterns on the Periodic Table”. Why do you think this is?

11. Bohr Models Na would have a low electronegativity and ionization energy because it doesn’t want to keep the valence electron and it doesn’t want to attract more electrons Cl would have a high electronegativity and ionization energy because it doesn’t want to loose any electrons and it wants to attract another one If one goes down the other has to as well. If you don’t want to attract electrons, then you want to loose them, so it can’t take a lot of energy to remove the electron

12 + 13. Radius of Sodium Atom vs. Chlorine Atom Atoms are neutral Same # of p+ & e- Why does Na have a larger atomic radius than Cl? Holds them tighter “More” Positive = More Pull Sodium Atom Chlorine Atom 11 protons 17 protons 11 electrons 17 electrons 17+ 11+

In the notes section… Put today’s date and title your notes “Periodic Table Basics” I would also get out your periodic table and make notations on your table as well as we go along.

Location and Properties of… Non-Metals Metals? Non-metals? Metalloids? Noble Gases? Metals Metals are on the left of the staircase they a) conduct heat and electricity, b) malleable, c) often shiny, and d) loose electrons in an ionic bond. Non-metals are on the right of the staircase they have the opposite properties of non-metals and the gain electrons in an ionic bond. Metalloids elements that touch the staircase – have characteristics of both metals and non-metals Noble Gases – the far right column. These gases are considered to be inert/unreactive. They have fuller outer shells with 8 electrons therefore, they don’t react with any other elements

Groups/Families and Periods Groups are columns, periods are rows!

- + Metals vs. Non- Metals Metals =Loser Non-Metals =Thieves Positive = Ca+ions Non-Metals =Thieves Neg = Anions - +

Ion– charged particle (uneven # of p+ & e-) Octet Rule- Atoms tend to gain/lose/share electrons to have 8 valence electrons. Valence electrons– outer most electrons Column 1 has 1 valence e – Column 2 has 2 valence e-, etc. Na would have a low electronegativity and ionization energy because it doesn’t want to keep the valence electron and it doesn’t want to attract more electrons Cl would have a high electronegativity and ionization energy because it doesn’t want to loose any electrons and it wants to attract another one If one goes down the other has to as well. If you don’t want to attract electrons, then you want to loose them, so it can’t take a lot of energy to remove the electron

Let’s make a foldable study guide… Fold your paper “hamburger” style. You will make two cuts to create three flips on your folded paper Use color markers or color pencils on your foldable Follow my example…

Atomic Radius: useful Decreases Decreases More protons = tighter hold on electrons, But More electron shells = bigger atom

Electronegativity: Useful Increases Closer to F = hungrier for electrons Column 8 is Full, so its electronegativity is 0

Ionization Energy: Useful Increases Closer to full, the stronger elements hold onto their electrons.

Tackle 14-20 With your group

Exit Task (in lab book!) Phosphorus is an important element in making DNA and cell membranes! What is its atomic #? What is its mass #? How many protons does a phosphorus atom have? electrons? neutrons?