15 Notes: Coulombic Attraction 73 Monday, December 15, 2014 Homework: Agenda Questions 13-16 Objective: We will be able to identify and explain trends in the periodic table. Catalyst: What is the electron configuration and orbital filling diagram for phosphorus? ***READ THIS!!!!*** Announcements: No tutoring today. Sign up for remind group! Test Thursday! 15 Notes: Coulombic Attraction 73

Agenda Catalyst/Announcements Electron Configuration Practice Coulombic Attraction & Atomic Radius Trend

Practice What is the correct electron configuration for: Boron? 1s22s22p1 Magnesium? 1s22s22p63s2 Aluminum? 1s22s22p63s23p1 Chlorine? 1s22s22p63s23p5

Coulombic Attraction Opposite charges attract. Like charges repel. **Draw this picture in your notes!!

Coulombic Attraction Think about it: Why don’t the protons in atoms nucleus repel each other? Chem team!!! I know my explanations are very over-simplified and so if you think of a better way to word these challenge questions PLEASE feel free to edit/change.  I just wanted to include them because students ask these every year in class.

Coulombic Attraction Simplified Answer: They do! This is why it’s so difficult to make “super heavy” elements with a nucleus that contains more than 109 protons. Chem team!!! I know my explanations are very over-simplified and so if you think of a better way to word these challenge questions PLEASE feel free to edit/change.  I just wanted to include them because students ask these every year in class.

Coulombic Attraction Simplified Answer: It is thought that the neutrons may help “buffer” the repulsion force. Also, there exists a “strong nuclear force” that exists which helps keep the nucleus together. Chem team!!! I know my explanations are very over-simplified and so if you think of a better way to word these challenge questions PLEASE feel free to edit/change.  I just wanted to include them because students ask these every year in class.

Coulombic Attraction Think about it: Why don’t the electrons fall towards the nucleus and stick to it? Chem team!!! I know my explanations are very over-simplified and so if you think of a better way to word these challenge questions PLEASE feel free to edit/change.  I just wanted to include them because students ask these every year in class.

Coulombic Attraction Simplified Answer: They begin to! Electrons are moving so fast with so much momentum that they have too much energy to fall too close to the nucleus. Chem team!!! I know my explanations are very over-simplified and so if you think of a better way to word these challenge questions PLEASE feel free to edit/change.  I just wanted to include them because students ask these every year in class.

Trends Think about it: How would Coulombic attraction change down a group on the periodic table? Why? Chem team!!! I know my explanations are very over-simplified and so if you think of a better way to word these challenge questions PLEASE feel free to edit/change.  I just wanted to include them because students ask these every year in class.

Trends Think about it: As you go DOWN a group the number of energy levels INCREASES The valence electrons are farther away from the nucleus

Trends As you go down a group, electrons are farther away from the nucleus, and not being pulled as tightly to the nucleus = atom has a bigger radius! Chem team!!! I know my explanations are very over-simplified and so if you think of a better way to word these challenge questions PLEASE feel free to edit/change.  I just wanted to include them because students ask these every year in class.

Trends Think about it: How would Coulombic attraction change across a period on the periodic table? Why? Chem team!!! I know my explanations are very over-simplified and so if you think of a better way to word these challenge questions PLEASE feel free to edit/change.  I just wanted to include them because students ask these every year in class.

Trends Think about it: As you go ACROSS the period the atomic number (# of protons) INCREASES However, the energy level with the valence electrons stays the same Chem team!!! I know my explanations are very over-simplified and so if you think of a better way to word these challenge questions PLEASE feel free to edit/change.  I just wanted to include them because students ask these every year in class.

Trends Think about it: As you go ACROSS the period the atomic number (# of protons) INCREASES However, the energy level with the valence electrons stays the same Chem team!!! I know my explanations are very over-simplified and so if you think of a better way to word these challenge questions PLEASE feel free to edit/change.  I just wanted to include them because students ask these every year in class.

Trends As you go ACROSS a period, atomic radius DECREASES because there are MORE electrons and MORE protons that are attracting each other. Chem team!!! I know my explanations are very over-simplified and so if you think of a better way to word these challenge questions PLEASE feel free to edit/change.  I just wanted to include them because students ask these every year in class.

Trends Coulombic attraction increases Coulombic attraction increases Chem team!!! I know my explanations are very over-simplified and so if you think of a better way to word these challenge questions PLEASE feel free to edit/change.  I just wanted to include them because students ask these every year in class.

This also means… Atomic Radius Increases! Coulombic attraction increases Coulombic attraction increases Atomic Radius Increases! Chem team!!! I know my explanations are very over-simplified and so if you think of a better way to word these challenge questions PLEASE feel free to edit/change.  I just wanted to include them because students ask these every year in class.

15 Periodic Table Trends: Overview 74 Tuesday, December 16, 2014 Homework: Agenda Questions 18a, 19 Objective: We will be able to identify and explain trends in the periodic table. Catalyst: Why does atomic radius decrease as Coulombic attraction increases? ***READ THIS!!!!*** Announcements: Tutoring today! Sign up for remind group! Test Thursday! 15 Periodic Table Trends: Overview 74

Agenda Catalyst/Announcements Homework Check Atomic Radius Trend

Wednesday, December 16, 2014 Homework: Study for test! ***READ THIS!!!!*** Announcements: Tutoring today! Sign up for remind group! Test TOMORROW! Homework: Study for test! Objective: We will review unit 4 concepts. Catalyst: What have we done this unit that you think will be the hardest on the test?

Whiteboard Practice What is the correct electron configuration for: Boron? 1s22s22p1 Magnesium? 1s22s22p63s2 Aluminum? 1s22s22p63s23p1 Chlorine? 1s22s22p63s23p5

Whiteboard Practice Which family of elements has 1 valence electron? Alkali Metals

Whiteboard Practice Which family of elements has 7 valence electrons, and is colorless, odorless, and tasteless? Halogens

Whiteboard Practice Give an example of an element in the Alkaline Earth metals family. Be, Mg, Ca, Sr, Ba, Ra

Whiteboard Practice Columns going down the periodic table are called _______. Rows going across the periodic table are called _______. Groups or families Periods

Whiteboard Practice Which of these elements has chemical properties most similar to calcium? Strontium? Potassium? Germanium? Strontium

Whiteboard Practice How did Mendeleev first organize the periodic table? How did he re-organize the periodic table later? Atomic Mass Chemical properties

Whiteboard Practice List five characteristics of metals. Hard Shiny Conducts heat and electricity Ductile Malleable Reacts with Acid

Whiteboard Practice A new element is discovered that is brittle, conducts heat and electricity, and does not react with acid. Is it a metal, nonmetal, or metalloid? Metalloid

Whiteboard Practice Draw the orbital filling diagram AND electron configuration for Fluorine. 1s22s23p5

Whiteboard Practice What is a metalloid? Has some properties of metals and some properties of non metals (a mix of both sets of properties)

Whiteboard Practice Give two examples of elements that are metals. Any element on the left side of the periodic table before the stairstep line

Whiteboard Practice Give two examples of elements that are nonmetals. Anything on the far right after the stairstep NOT including metalloids

Whiteboard Practice Is hydrogen a metal, nonmetal, or metalloid? (HINT: This is kind of a trick question!) Hydrogen doesn’t behave like metals, non-metals, or metalloids

Whiteboard Practice WHY does atomic radius decrease as Coulombic attraction increases? As electrons and protons are closer and when there are more protons and electrons attracted to each other, the atom is smaller because the particles are being held more closely together.

Whiteboard Practice How many electrons fit in: An s sublevel? A p sublevel? A d sublevel? 2 6 10

Whiteboard Practice Nykira wants to play a trick on Armani and get him to touch an electrically charged wire. What type of element should Armani use to touch the wire with if he wants to avoid getting shocked? Armani should use a nonmetal (anything on the right of the periodic table, after the metalloids)

Whiteboard Practice Draw the orbital filling diagram for oxygen. 1s22s22p4

Whiteboard Practice Lilronald was in the lab and identified what he thinks is Calcium, because it has 20 electrons, and the electron configuration ends in 4s. Is he correct? How do you know? He is correct!

Whiteboard Practice Luna has found an element that has an electron configuration ending in 2p. List a possible element that she could have found. She could have found boron, carbon, nitrogen, oxygen, fluorine, or neon.

Whiteboard Practice Which of the following sublevels can contain 6 electrons? A p sublevel

Whiteboard Practice Which of the following elements will have the smallest atomic radius? Neon Lithium Selenium Radon Neon

Whiteboard Practice As Coulombic attraction increases, atomic radius ___________. decreases

Whiteboard Practice Identify the group number for each of the following family names: Halogens Alkaline Earth Metals Alkali Metals Noble Gases 17 2 1 18

Whiteboard Practice How many electrons are in Xenon? 54

Whiteboard Practice Which elements has chemical properties most similar to Neon? Fluorine Boron Chlorine Argon Argon

Whiteboard Practice Which of the following elements is a metalloid? Silicon Lithium Aluminum Sulfur Silicon

Clean up! Wipe down your boards, put them away, and place the markers in the basket.

Exit Slip Thinking about the test tomorrow: What do you feel most confident about? What do you feel least confident about? How are you going to prepare?