True statements regarding the alkali and naturally occurring lanthanide metals include: I. The chemical reactivity of the alkali metals is due to their low first ionization energies. II. Radioactive nuclei can only become more stable by forming compounds. III. The alkali and lanthanide metals increase their chemical stability by forming compounds.

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True statements regarding the alkali and naturally occurring lanthanide metals include: I. The chemical reactivity of the alkali metals is due to their low first ionization energies. II. Radioactive nuclei can only become more stable by forming compounds. III. The alkali and lanthanide metals increase their chemical stability by forming compounds.