Presentation on theme: "Unit 2 – Matter and Chemical Change. Topic 4 – Classifying Elements Elements are given symbols from Latin, planets, scientists, places They can be."— Presentation transcript:
Topic 4 – Classifying Elements Elements are given symbols from Latin, planets, scientists, places They can be classified into: Metals – shiny, solid, conductors, malleable, ductile
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
(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
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
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).
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.
Alkaline Earth Metals – Group 2 These are relatively reactive metals They lose 2 electrons in reactions when they become an ion.
Halogens Group 17 These are very reactive nonmetals They gain 1 electron in reactions when they become an ion.
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
Noble Gases - Group 18 These are inert, nonreactive gases They won’t transfer electrons since all their energy levels are full.
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
The Periodic Table - Crash Course https://www.youtube.com/watch?v=0RRVV4Diomg https://www.youtube.com/watch?v=0RRVV4Diomg