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8th Grade Science
February 20, 2014
Do Now
Complete on a sticky note:
The periodic table is organized by…
8th Grade Science
Today’s Schedule1. Do-Now2. Cornell notes3. Dry erase practice4. Compare and Contrast
Elements5. Element Bingo6. Conclusion Questions7. 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
8th Grade Science
Essential Question:
What determines the reactivity of an element?
Questions Notes
The number of electrons in the outside orbital are Valence electrons.These determine how reactive anelement 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…
8th Grade Science
2.
3.
4. 5.
6.
7.
1 valence electron=VERY REACTIVE
Valence Electrons-Filled, not reactive. Noble Gases
Groups
Periods
8th Grade Science
Atomic Structure
How many valance electrons does this element have?
8th Grade Science
Atomic Structure
Which group?
Which period? 1
H1.008
Hydrogen
8th Grade Science
Atomic Structure
Which group?
Which period? 8
O15.999Oxygen
8th Grade Science
Atomic Structure
Which group?
Which period? 11
Na22.999Sodium
8th Grade Science
Atomic Structure
How many valence electrons?
8th Grade Science
Atomic Structure
How many valence electrons?
8th Grade Science
Atomic Structure
Which element is in period 4 and has 1 valence electron?
8th Grade Science
Atomic Structure
Which element is in period 2 and has 2 valence electrons?
8th Grade Science
Atomic Structure
Which element is in period 3 and group 17?
8th Grade Science
Atomic Structure
Which element is in group 2 and has 7 valence electrons?
8th Grade Science
Atomic Structure
Which is more reactive: lithium or neon?
8th Grade Science
Atomic Structure
Which is more reactive: argon or potassium?
8th Grade Science
Brainpop – Atomic ModelIons- This is why chemical reactions happen.
YouTube- 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
8th Grade Science
Sodium Aluminum
Atomic # group # energy levelsProton # # valence electrons periodElectron # reactivityNeutron # metal, nonmetal, or metalloidAtomis mass
Compare and Contrast ElementsWork with your shoulder partner to complete the following:
8th Grade Science
SodiumAtomic number =11
11 protons11 electrons12 neutrons
Atomic mass=22.99 amu1st group
1 valence electronVery reactive metal in 3rd
period.
AluminumAtomic number =13
13 protons13 electrons14 neutrons
Atomic mass = 26.982 amu
13th group3 valence electrons
Least reactive metal in 3rd period.
Atomic # group # energy levelsProton # # valence electrons periodElectron # reactivityNeutron # metal, nonmetal, or metalloidAtomis mass
Metals3rd period3 energy
levels
Compare and Contrast Elements
8th Grade Science
Fill in your Bingo card with element names from the left. In a random order.
Element Bingo
8th Grade Science
1. Students will work in groups of 4.2. 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
8th 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
8th Grade Science
Today’s Schedule1. Do-Now2. Cornell notes3. Dry erase practice4. Compare and Contrast
Elements5. Element Bingo6. Conclusion Questions7. 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
