Online Chemical Equation Balancer
Omni Chemistry Calculators - This site contains numerous chemistry calculators, including atomic mass, bond order, chemical name, electron configuration, electronegativity, molar mass, percent composition, empirical formula, grams to moles, number of particles (based on Avogadro's number), grams to moles, hydrogen ion concentration, molality, molarity, molar mass of a gas, moles, molecular weight, moles to atoms, normality, mass percent, mixing ratio, percent concentration to molarity, pH, percent solution, actual yield, chemical equation balancing, percent yield, and more
Periodic Tables of the Elements:
Periodic Table of Elements with Electron Configuration, Electronegativity, and Oxidation States
Periodic Table of the Elements with Electron Configuration (1)