I will need help plz thank you The Earth's surface is water.

50 %

71 %

97 %

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

Convert the temperature of dry ice, –77 ∞c, into degrees fahrenheit and kelvin.

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.