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Warm up

Warm up. Draw a Bohr model of an atom of Arsenic. Warm up answer. Arsenic Number of Energy Levels: 4 First Energy Level: 2 Second Energy Level: 8 Third Energy Level: 18 Fourth Energy Level: 5. Today’s activities. Complete Bohr Model of the atom worksheet (part B) Notes.

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Warm up

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  1. Warm up • Draw a Bohr model of an atom of Arsenic

  2. Warm up answer • Arsenic • Number of Energy Levels: 4First Energy Level: 2Second Energy Level: 8Third Energy Level: 18Fourth Energy Level: 5

  3. Today’s activities • Complete Bohr Model of the atom worksheet (part B) • Notes

  4. Determining Formulas • Now with knowledge of ion charges, we can determine the formula of simple compounds given the elements involved • Magnesium and Chlorine • Mg2+ and Cl- • To even out charges it takes 2 chlorides for every magnesium • MgCl2

  5. You determine the formulas • Hydrogen and Oxygen • H+ and O2- • Takes 2 hydrogens for every oxide • H2O • Aluminum and Sulfur • Al3+ and S2- • Will require 2 aluminums with 3 sulfides • Al2S3

  6. Groups • Alkali Metals • Alkaline Earth Metals • Transition Metals • Halogens • Noble Gases

  7. Alkali Metals • Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs) and Francium (Fr) • Because they all have one e- in their outer shell, they are VERY REACTIVE • When put in pure water, can cause explosions • Shiny and light in weight K in water!

  8. Alkaline Earth Metals • beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba) and radium (Ra) • When mixed in compounds, will have a pH higher than 7= base • Has 2 e- in outer shell, and make bonds really well

  9. Halogens • Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I), and Astatine (At). • Has 7 e- ion outer shell, so will often bond with a alkali metal (ex. NaCl) • Quite Reactive!

  10. Noble Gases • Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), and Radon (Rn) • Have a FULL outer level of e-… very happy! • Usually all by themselves, rarely bond • Often called inert because “chemically unreactive”

  11. Transition Metals • They have a lot of electrons and distribute them in different ways • are able to put more than eight electrons in the shell that is one in from the outermost shell • Can bond with many different elements because of their electrons and shells • Generally have intense color

  12. Cool down • What would be the chemical formula if you combined calcium and chlorine?

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