The atomic mass of iron is 55.85, and oxygen is 16.0. what is the mass of 6.02 × 1023 molecules of fe2o3? 71.85 g 143.7 g 159.7 g 199.55 g 215.55 g

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

Take a look at this dandelion. the yellow flower on the right is pollinated and the seeds on the left are transported by

Once similarity and one difference between a mixture of elements and a mixture of compounds