Soils frequently contain large amounts of both iron and alum…

Soils frequently contain large amounts of both iron and aluminum, and the solubility of common solid phases (oxides, hydroxyoxides) of both element vary strongly.  Despite these similarities, “the chemistry of — and concerns about — acid soils is said to be essentially the chemistry of Al”, not Al and Fe; why?

Based on the successive ionization energies of an unknown el…

Based on the successive ionization energies of an unknown element in the table provided, how many valence electrons does the element have?  Successive Ionization energies Number of Electrons Removed Ionization Energies (kJ/mol)  1 600 2 1200 3 3000 4 12,000 5 13,000 6 14,500 7 15,600