Classification of Elements (Lesson 5) Flashcards
Who is the father of the periodic table
Mendelev
How did Mendelev organize the table?
-He arranged element cards vertically according to atomic masses
-For an element that had chemical and physical characteristics similar to the first element in the previous column, he started a new column
-He placed the next element beside the element with similar properties
-He also left gaps for unknown elements
[characteristics repeat every 7 elements)
Periodic Law
when elements are arranged by atomic number their chemical/physical properties reoccur periodically
Caterogies in Periodic Table based on chemical properties
- Alkali Metals
- Alkaline Earth Metals
- Transition Metals
- Other non-metals
- Metalloids
- Other metals
- Halogens
- Noble Gases
- Ianthanoids
- Actinoids
Caterogies in Periodic Table based on electronic configuration
- Main group Elements
- B block elements
- Inner Transition Elements
Alkali Properties
−Highly reactive
−Create bases when combined with water
−“basic”
Alkaline Earth Metal Properties
−Produce bases when combined with water
−Reactive but less than alkali metals
Transition Metal Properties
−Complex electron configuration
−Very hard metals with high melting points
−Can form many compounds w/ other elements
Other Metal Properties
−Not as reactive as alkali and alkaline earth metals
−Common and useful
Other Non Metal Properties
−Non metals that aren’t halogens or noble gases
−Neither as reactive as halogens or unreactive as noble gases
−Most common elements in living organism tissues
Metalloid Properties
−Properties between metals and non metals
−Shiny solids but poor electric current conductors
Halogen Properties
−Can easily form to create salts
−Reactive non metals
Noble Gase Properties
−Don’t react with other elements
−Full valence shell
−Exist as monoatomic gases in normal state
−Extremely unreactive
Ianthanoid Properties
−“Rare Earth Elements”
−Elements found rarely in Earth’s Crust
Actinoid Properties
−No stable isotopes
−All radioactive
