Select the correct answer.
Why does a solid change to liquid when heat is added?
OA. The spacing between particles decreases.
O B. Particles lose energy.
OC. The spacing between particles increases.
OD. The temperature decreases.
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Iknow #2 is d. i just need to know why

Explain why scientists use shared characteristics to make cladograms.

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