How many naturally occurring elements are there are on Earth? How many of those exist as native element minerals? - :b

Based on its chemical properties, identify the position of each chemical family on the periodic table.

Iron (3) oxide will decompose in the presence of hydrogen gas and heater to produced iron and digydrogen monoxide white a balanced chemical equation

Calculate the energy required to ionize a hydrogen atom to an excited state where the electron is initially in the n = 5 energy level. report your answer in kilojoules