True or false: A nebula is a region of gas and dust where stars are born, whereas a planetary nebula occurs at the end of a stars life and is the remains of an average star after it becomes a red giant

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

What substance has a mass of 9.5g and volume of 2.1cm^3

In what environment would mineral formation caused by high pressures and high temperatures most likely occur?