Carbon-14 is the typical radioisotope used to date materials; however it has limitation to 4 years a scientist who wants to date materials older than 4 years would most likely use
a. uranium- 238
b. rubidium- 91
c. iodine- 131
d. cobalt- 60

__can be defined as which velocity changes

Write the overall equation for the reaction for lithium battery

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false