CHEM CH2-2

groups of elements designated by the letter A

groups of elements designated by the letter B

horizontal rows

-first seperate row
-second seperate row
-why are they not included in the main table?

-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)

-group 1A
-are they very reactive?
-how do they allways exist in nature?

-group 2A
-what do they form when they react with water?

-group 7A
-composed entirely of...
-very reactive?
-form what when combined with alkali metals?

-group8A
-very reactive?

shiny soilds that react vigourously with air, water, and halogens:

group 6A

IUPAC

another name for metalloid

2 elements that exist as liquids at room temp

elements that exist as gases at room temperature

-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: