Which of the following pairs of elements is most likely to form an ionic bond?
a.
calcium and fluorine
b.
carbon and oxygen
c.
phosphorus and chlorine
d.
nitrogen and oxygen

The minerals found in bones are deposited by living cells called

What are scientists who study fossils called? ( a ) astronomers. ( b ) biologists. ( c ) geologists. ( d ) paleontologists.

Consider the following reactions. (note: (s) = solid, (l) = liquid, and (g) = gas.) mg(s) + ½o2(g) → mgo(s) + 146 kcal/mole h2(g) + ½o2(g) → h2o(g), δh = -57.82 kcal/mole what type of reaction is represented by the previous two examples?