Which of the following is not equal to 63.7 mm?

6.37 x 104 ãƒâ‚ã‚âµm
6.37 x 10-5 km
637 cm
0.637 dm

How is the composition of a meteorite relevant to finding out the composition of earth's core?

Smog is the term used to describe the combination of fog and smoke

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