Select the correct answer from each drop-down menu. in the
Because of Earth's gravity, most of the gases in the atmosphere are found close to Earth's surface. That's why the
| tempature or air pressure | in the troposphere is | higher or lower |
than in any other layer of Earth's atmosphere.

Select all that apply. a beta particle: is electromagnetic energy is an electron has zero charge is emitted from the nucleus has a +2 charge has a -1 charge

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

0.09 moles of sodium sulfate in 12 ml of solution