Friday, October 28, 2011

my fav. four elements




Iodine
  • atomic # - 53
  • chemical symbol - I
  • atomic mass - 126.9
  • properties - blue- black liquid that can be used to break down carbohydrates
  • discovery info - bernard coutois 1811(france)
  • melting point -  1113.5 degrees C
  • boiling point - 184.35 C
  • electron configuration - (Kr)5s2 4d10 5p5
  • part of the halogens in group 5A
potassium
  • atomic # - 19
  • chemical symbol -  K
  • atomic mass - 39.1
  • properties - very soft , found in soil, cathches fire when in water 
  • discovery info - sir humphrey davy (england) 1807
  • melting point -  63.25 degrees C
  • boiling point - 760 degrees C
  • electron configuration - (Ar) 4s1
  • group 1A in the alkali metals
silicon
  • atomic # - 14
  • chemical symbol -  Si 
  • atomic mass - 28.1
  • properties - one of the  most widely used elements, found in plant life, used in steel, 2nd most abundant element
  • discovery info - Jons jacob berzelius 1824 (sweden)
  • melting point -  1410 degrees C
  • boiling point - 2355 degrees C
  • electron configuration -  (Ne) 3s2 3p2
  • part of group 4A in period 3
mercury
  • atomic # - 80
  • chemical symbol - Hg 
  • atomic mass - 200.6
  • properties - the only  one of 2 metals to be a liquid at room temp., can be poisonous 
  • discovery info - known in ancient china and hindu countries
  • melting point -  38.842 degrees C
  • boiling point - 356.58 degrees C
  • electron configuration -  (Xe) 6s2 5d9
  • part of the 2b group, transition metal

Wednesday, October 12, 2011

are you bright about neon signs?

everyone has seen those bright electrically colored signs known as neon signs, but neon is not the only thing in those bright light up signs. these signs really contain neon, argon, krypton, helium, and xenon. all those colors you see are the cause of the excited electrons on the atomic emission spectrum and based on the elements  they give off a certain color. such as helium has a pinkish tint, xenon is lavender, argon is blueish, and krypton is yellowish.