A sample of carbon-12 has a mass of 6. 00 g. How many atoms of carbon-12 are in the sample? 3. 01 Ă— 1023 6. 02 Ă— 1023 1. 20 Ă— 1024 3. 60 Ă— 1024.

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