(a) The formula of the simplest hydrocarbon is CH4 (methane). Predict the formulas of the simplest compounds formed between hydrogen and the following elements: silicon, germanium, tin, and lead.
(b) Sodium hydride (NaH) is an ionic compound. Would you expect rubidium hydride (RbH) to be more or less ionic than NaH?
(c) Predict the reaction between radium (Ra) and water.
(d) When exposed to air, aluminum forms a tenacious oxide (Al2O3) coating that protects the metal from corrosion. Which metal in Group 2A would you expect to exhibit similar properties? Why?