1. Warm Up 10-2-17 Element Al and Ar are in the same______
How many valence electrons are in Ca and Ga element?
What’s wrong with this model of the carbon atom?
Group 1 reactivity
Demo - Magnesium burning Demo - battery and aluminum foil/gum wrapping
Agenda
-Turn in WS Homework -Notes Unit 3-2 -Lab
Homework
Finish lab conclusion
Oct 4 – Test correction

2. Unit 3-2 Periodic Groups/Families

3. Classification Elements are classified as Metals
Metalloids (semimetals)
Nonmetals

4. Classification
77% of all the elements are metals

5. 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
Talk about wires (landline, and internet) that are used as conductor – Expensive speakers with gold coating for better sounds (Beats by Dre headphones)

6. Check-In
A = metals B = non metals C = metalloids Classify the following elements: 1.Na 2.H 3.Si

7. Main Groups Main Groups Main Groups Transition Groups Inner Transition
Elements

8. Main Groups
Use group number to find valence electrons

9. Cesium
Alkali Metals
Group 1
Highly reactive, (easily combine with other elements) reactivity increases going down a group
Found in nature as compounds
Potassium
Sodium
Alkali metals Lithium burns red and use in battery (lithium-ion)
Electrolytes in sport drinks, potassium helps muscles contract

10. Alkaline Earth Metals Group 2 2nd most reactive group
Give away 2 valence electrons
calcium
Calcium build bones
Magnesium deficient can lead to depression. Cerebral spinal fluid (CSF) magnesium has been found low in treatment-resistant suicidal depression patients
barium
beryllium

11. Transition Metals d and f blocks
Most lanthanides and actinides (f-block) are radioactive.
Generally less reactive than alkali and alkaline earth metals
Do not have identical outer electron configurations Common metals that a person will think of (copper, iron, gold, silver, zinc)
electric fence brainiac video
Uranium ore

12. Halogens
Group 17
Have 7 valence electrons and gain 1 electron in reactions (highly reactive)
Reactivity decreases going down a group
chlorine bromine iodine
Halogens are oxidants (elements that grab electrons and mess up the cells in your body)
Fluorine + carbon = teflon Halogens are non-metals
React with metals to form salts
Chlorine Gas

13. 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
Glow inside a gas-discharge lamp

14. Check-In
Group 1
Group 2
Group 17
Group 18

15. Hydrogen Most common element in the universe
Found in many organic compounds
Flammable
Fuel source for the sun (nuclear fusion)
combustion of hydrogen gas
Hindenburg 1937 going from Europe to New York (35 fatalities)

16. Assignments
Summary: Why are noble gases stable and doesn’t react? And why group 1 & 17 are very reactive?
Finish lab for homework