Which of the following is not an essential element for healthy plant growth? a. oxygen
b. nitrogen
c. potassium
d. phosphorus

The minerals found in bones are deposited by living cells called

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?

Connect the whole numbers on the periodic table to indicate what they represent?