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groups of elements designated by the letter A
main group elements
groups of elements designated by the letter B
transition group elements
-first seperate row
-second seperate row
-why are they not included in the main table?
- -lanthanide elements (58-71)
- -actinide elements (90-103)
- -because the table would be too wide
-left side elements
-how many quarters of the elements are in this group?
-upper right portion elements
-what percentage of elements are in this grouping?
-properties are intermediate between those of metals and those of non-metals (located between them)
-are they very reactive?
-how do they allways exist in nature?
- alkali metals
- allways in combination with other elements
-what do they form when they react with water?
- alkali earth metals
- alkali soultions
-composed entirely of...
-form what when combined with alkali metals?
- -noble (rare) gases
- -least reactive elements
shiny soilds that react vigourously with air, water, and halogens:
alkali metals, group 1A
International Union of Pure and Applied Chemistry
another name for metalloid
2 elements that exist as liquids at room temp
elements that exist as gases at room temperature
- 1. hydrogen
- 2. nitrogen
- 3. oxygen
- 4. flourine
- 5. chlorine
- 6. helium
- 7. neon
- 8. argon
- 9. krypton
- 10. xenon
- 11. radon
-extended strudture of atoms in a crystalline formation, all closely packed together and often containing 12 nearest neighbors
-which elements get this structure?
elements that form diatomic molecules (8)
elements that tend to form extended covalently bonded structures (7)
elements that form allotropes (4)
red phosphorus and white phosphorus are examples of:
forms of the same element with different physical and chemical properties: