1. Unit 2 – Matter and Chemical Change

2. Topic 4 – Classifying Elements  Elements are given symbols from Latin, planets, scientists, places  They can be classified into: Metals – shiny, solid, conductors, malleable, ductile

3. Classifying Elements  They can be classified into: Non metals – dull solids, liquid, gas, poor conductors, brittle Metalloids – solids, properties of metals and nonmetals combined. Boron

4. (from page 118) State at room temperature AppearanceConductivity Malleability and ductility Metals solids, except for mercury (a liquid) shiny lustre good conductors of heat and electricity malleable ductile Non-metals some gases some solids only Bromine is liquid not very shiny poor conductors of heat and electricity brittle not ductile Metalloids solids can be shiny or dull may conduct electricity Poor conductors of heat brittle not ductile

5.  https://www.youtube.com/watch?v=2xFx 7Ipaf8U https://www.youtube.com/watch?v=2xFx 7Ipaf8U

6. Chemical Families  Elements are arranged into vertical columns on the Periodic Table called groups or families.  The ones you must know about are the: Alkali metals – Group 1 Alkaline Earth metals – Group 2 Halogens – Group 17 Noble Gases – Group 18

7.  Four chemical families of the periodic table:  the alkali metals (I),  the alkaline earth metals (II)  halogens (VII,17),  And, the noble gases (VIII,18).

8. Alkali Metals – Group 1  These are very reactive metals  It does not include hydrogen since it’s a nonmetal  They lose 1 electron in reactions when they become an ion.

9. Alkaline Earth Metals – Group 2  These are relatively reactive metals  They lose 2 electrons in reactions when they become an ion.

10. Halogens Group 17  These are very reactive nonmetals  They gain 1 electron in reactions when they become an ion.

11. The Fluorine Atom  Atomic model for Fluorine (F)  It has 9 protons  10 neutrons  9 electrons  2 energy levels  2 in the first  7 in the second  8 e - s can fit in the second.  It wants 1 more

12. Noble Gases - Group 18  These are inert, nonreactive gases  They won’t transfer electrons since all their energy levels are full.

13. The Krypton Atom  Atomic model for Krypton (Kr)  It has 36 protons  48 neutrons  36 electrons  4 energy levels  2 in the first  8 in the second  18 e - s can fit in the third.  8 in the 4 th  All electrons are paired  No more are needed

14. The Periodic Table - Crash Course  https://www.youtube.com/watch?v=0RRVV4Diomg https://www.youtube.com/watch?v=0RRVV4Diomg