Which groups of elements are not included in the alien periodic table? do you think it is likely that an alien planet would lack these elements? explain.

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

How many atoms are there in 5.70 mol of mg

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true