What is a rule you can use to predict the shape of a molecule based on the number of atoms and line electron pairs (i. e., substituents) around a central atom?

Why do sodium and neon have vastly different chemical and physical properties despite having similar atomic masses?

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

Suppose you wanted to make 100 grams of water. what is the molar mass of water (h2o)?