If lead nitrate is added to a solution of calcium carbonate in equilibrium with its ions Ca2+(aq) + CO2−3(aq), the added lead will

Why are the trends and exceptions to the trends in ionization energy observed?

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?