Warm Up What is the difference between group and period on the periodic table? 2. How are elements arranged on the modern periodic table? 3. Who’s Mendeleev? HomeworkAgenda -Take Test unit 2 -Activity Breaking the code -Notebook check Unit 2 -Notes Unit 3-2

Test Unit 2  Review/Study for 10 minutes (unit 2)  23 questions, 2 free response  Do not write on the test  Record the free response answers on the back of your scantron

Activity Breaking the code  Arrange your cards (elements) according to the periodic table  Look for commonalities on why elements are in the same groups  Have your notebook out - I’ll check for unit 2 while you’re doing the activity

Warm Up Element Al and Ar are in the same______ 2. How many valence electrons are in Ca and Ga element? 3. What’s wrong with this model of the carbon atom? Homework Oct 1 - Quiz Unit 3 Agenda -Go over Unit 2 Test -Notes Unit 3-2 -Activity Trends

Unit 2 Test  In the golden penny lab, the reason why the penny turned gold is because  The metallic gold appearance achieved by coating the penny with zinc  The zinc and hydroxide solution turned the penny silver then gold  Zinc combined with copper will give an alloy brass with the yellow color  The high heat from the hot plate transformed copper atoms into gold atoms

Unit 2 Test  True or false: Most of the volume occupied by a piece of copper is taken up by the volume of the copper nucleus  Most of the volume of an atom is occupied by the  Electron cloud  Protons  Nucleus  Nuclides

Unit 2 Test  Version 1Version 2

Unit 3-2 Periodic Groups and Families

Metals Properties

 They are good conductors of electricity  Most are ductile (can be stretched) and malleable (can be hammered or rolled into sheets)  Can form alloys - solid or liquid mixtures of metals

Check-In A = metals B = non metals C = metalloids Classify the following elements: 1.Na 2.H3.Si

Main Groups Transition Groups Inner Transition Elements Main Groups

Use group number to find valence electrons

Alkali Metals  Group 1  Highly reactive (easily combine with other elements)  Found in nature as compounds  React with water to make alkaline (basic) solutions  Will give away 1 valence electron Cesium

Alkaline Earth Metals  Group 2  2 nd most reactive group  Give away 2 valence electrons calcium

Transition Metals  d and f blocks  Most lanthanides and actinides (f-block) are radioactive.  Generally less reactive than alkali and alkaline earth metals Uranium ore

Halogens  Group 17  Have 7 valence electrons and gain 1 electron in reactions (highly reactive)  React with metals to form salts  Halogens are non-metals

Noble Gases  Group 18  Eight valence electrons makes them very stable (outermost energy level is full)  Also called inert gases because of they are non-reactive

Check-In  Group 1  Group 2

Hydrogen  Most common element in the universe  Found in many organic compounds

Assignments  Summary  WS from last class (breaking the code) due today  Activity Trends WS due today