Take out a piece of paper and a pencil, Nothing else. Sit in your assigned seat, do not ask any questions and do not talk. Wait for further directions when the bell rings.

Respect and the importance at school What is respect? Why does it matter in school? How can we show it in the classroom? How have you showed it and/or how you have not showed it in the classroom? How is this all really respecting yourself?

Science Starter What are 3 differences between ionic and covalent compounds? What happens to make Ca -> Ca2+ What happens to make S-> S2- **Turn in weeks science starter by passing them to the bin at the front**

Objective SWBAT draw Lewis Dot diagrams of all elements in the s- and p-block SWBAT identify charges of all s- and p-block elements based on the number of valence electrons and the octet rule SWBAT properly write the chemical formula of ionic compounds

Agenda Science Starter Intro to Bonding Valence Electrons Lewis Dot Diagrams The Octet Rule Charges Ionic Puzzles Work Time

Unit 3: Bonding and Nomenclature Lewis Dot Diagrams and Charges February 26, 2016

RECAP! Valence Electrons Valence electrons: electrons in the highest energy level (outer shell). For representative elements, the group number represents the # of valence electrons. # of valence electrons determines properties.

Identify the # of Valence Electrons. Copy these down into your notes! Be F Ne As K S Rb Kr

Lewis Dot Diagrams Electron Dot Diagrams (aka Lewis Dot Diagrams)- diagrams that show valence electrons as dots. DIRECTIONS: Write Chemical Symbol Put one dot (representing electrons) on each side of symbol before you put a second one on that side.

Practice Element # of Valence Electrons Lewis Dot Structure Ga Xe Ca N

What is the Octet Rule? Octet rule- in forming compounds, atoms tend to gain, lose, or share one or more of their valence electrons to achieve a filled outer electron shell. aka atoms want the same # of electrons as the noble gases (typically 8 valence electrons)

Stop and Think: Is it easier to move 6 boxes or 2 boxes?

Practice Time….

Charges How many valence electrons does Ca have? How many does it want? What is it going to do to get it? How many valence electrons does N have?

Atoms only form certain ions. Group 1 – 3 are GIVERS They all have positive charges – they will give away ALL of their electrons Group 14 elements are GIVERS or TAKERS Group 15-17 are TAKERS They have negative charges. They steal their electrons.

KEY POINT QUICK RECAP INDEPENDENTLY: Metals- lose electrons Nonmetals- gain electrons QUICK RECAP INDEPENDENTLY: What is a CATION? What is an ANION?

When a nonmetal and a metal meet each other, they can’t share When a nonmetal and a metal meet each other, they can’t share. They’re too different! So…the nonmetal will GRAB electron(s) from the metal.

It forms an ION. Hence, the name IONIC bond Ionic Compounds = made of a metal and a nonmetal

Ionic Puzzle Cut out the cation and anion puzzle pieces. Place the cards together, adding additional cards of the same ion until the heights of the cations and anions are equal. Count the number of each ion needed for the heights to be equal and record You must make at least 5 ionic compounds before answering the questions on the back!

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