8 th Grade Science February 20, 2014 Do Now Complete on a sticky note: The periodic table is organized by…

8 th Grade Science Today’s Schedule 1. Do-Now 2.Cornell notes 3.Dry erase practice 4.Compare and Contrast Elements 5.Element Bingo 6.Conclusion Questions 7.Independent Study/Practice…Grades due on Friday!!! Dark Matter Objectives: Today we will… 8.5 (A) describe the structure of atoms, including the masses, electrical charges, and locations, of protons and neutrons in the nucleus and electrons in the electron cloud 8.5(B) identify that protons determine an element's identity and valence electrons determine its chemical properties, including reactivity

8 th Grade Science Essential Question: What determines the reactivity of an element? QuestionsNotes The number of electrons in the outside orbital are Valence electrons. These determine how reactive an element is. (reactive-reacts a lot with other elements). -Elements in group 1 are VERY REACTIVE because they easily lose 1 valence electron. -Elements in group 18 don’t react, because their outer orbital is full of electrons. They are called Noble Gases. The atom to the right has ___ valence electrons, because…

8 th Grade Science valence electron=VERY REACTIVE Valence Electrons-Filled, not reactive. Noble Gases Groups Periods

8 th Grade Science Atomic Structure How many valance electrons does this element have?

8 th Grade Science Atomic Structure Which group? Which period? 1 H Hydrogen

8 th Grade Science Atomic Structure Which group? Which period? 8 O Oxygen

8 th Grade Science Atomic Structure Which group? Which period? 11 Na Sodium

8 th Grade Science Atomic Structure How many valence electrons?

8 th Grade Science Atomic Structure How many valence electrons?

8 th Grade Science Atomic Structure Which element is in period 4 and has 1 valence electron?

8 th Grade Science Atomic Structure Which element is in period 2 and has 2 valence electrons?

8 th Grade Science Atomic Structure Which element is in period 3 and group 17?

8 th Grade Science Atomic Structure Which element is in group 2 and has 7 valence electrons?

8 th Grade Science Atomic Structure Which is more reactive: lithium or neon?

8 th Grade Science Atomic Structure Which is more reactive: argon or potassium?

8 th Grade Science Brainpop – Atomic ModelAtomic Model Ions-Ions- This is why chemical reactions happen. YouTube- Valence ElectronsYouTube- Valence Electrons. They don’t have to know about electron configuration, but it will let them know where they are headed with this in high school. Watch the Brainpop videos if you have time at the end. Chemistry Video

8 th Grade Science Sodium Aluminum Atomic #group# energy levels Proton ## valence electronsperiod Electron #reactivity Neutron #metal, nonmetal, or metalloid Atomis mass Compare and Contrast Elements Work with your shoulder partner to complete the following:

8 th Grade Science Sodium Atomic number =11 11 protons 11 electrons 12 neutrons Atomic mass=22.99 amu 1 st group 1 valence electron Very reactive metal in 3 rd period. Aluminum Atomic number =13 13 protons 13 electrons 14 neutrons Atomic mass = amu 13 th group 3 valence electrons Least reactive metal in 3 rd period. Atomic #group# energy levels Proton ## valence electronsperiod Electron #reactivity Neutron #metal, nonmetal, or metalloid Atomis mass Metals 3 rd period 3 energy levels Compare and Contrast Elements

8 th Grade Science Fill in your Bingo card with element names from the left. In a random order. Element Bingo

8 th Grade Science 1.Students will work in groups of The group will decide who will be in charge of the bingo call list. They will keep track of which cards are called. 3.Stack the Bingo cards face down in the center of the table. 4. The person at the red seat will begin by reading the top Bingo card to the group. 5. The group will use their Periodic Table to answer the question. 6. Each student will mark their answer on their Bingo card. 7. The first person in the group to get 4 in a row wins. Element Bingo

8 th Grade Science Questions after Element Bingo Answer these in your notebook using complete, reflective sentences. 1.How are groups and periods helpful in locating an element on the Periodic Table? 2.What information is needed to identify an element? 3.How does the reactivity of a metal differ from nonmetals? 4.Where are the most reactive metals located on the Periodic table? 5.What determines the reactivity of a metal? 6.Where on the Periodic Table are the most reactive nonmetals located? Element Bingo

8 th Grade Science Today’s Schedule 1. Do-Now 2.Cornell notes 3.Dry erase practice 4.Compare and Contrast Elements 5.Element Bingo 6.Conclusion Questions 7.Independent Study/Practice…Grades due on Friday!!! Dark Matter Objectives: Today we will… 8.5 (A) describe the structure of atoms, including the masses, electrical charges, and locations, of protons and neutrons in the nucleus and electrons in the electron cloud 8.5(B) identify that protons determine an element's identity and valence electrons determine its chemical properties, including reactivity