Which particles make up the nucleus of an atom?
a. protons and electrons
b. neutrons and electrons
c. protons only
d. protons and neutrons
e. neutrons only

Explain the relationship between forward and backward reactions in equilibrium, and predict how changing the amount of a reactant (creating a tension) will affect that relationship.

Ineed ! i have no clue how to do this problem.

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