Elements are organized on the periodic table based on their properties. which statement correctly predicts and explains the chemical reactivity of two different metals?

barium (ba) is less reactive than calcium (ca) because the valence electrons in calcium atoms are farther from the nuclei and harder to remove.
strontium (sr) is more reactive than magnesium (mg) because the valence electrons in strontium atoms are farther from the nuclei and harder to remove.
rubidium (rb) is more reactive than sodium (na) because the valence electrons in sodium atoms are closer to the nuclei and easier to remove.
lithium (li) is less reactive than potassium (k) because the valence electrons in lithium atoms are closer to the nuclei and harder to remove.

Answer is: Lithium (Li) is less reactive than potassium (K) because the valence electrons in lithium atoms are closer to the nuclei and harder to remove.

Potassium has lower first ionization energy than lithium, so potassium easier remove one valence electron.

The ionization energy (Ei) is the minimum amount of energy required to remove the valence electron, when element lose electrons, oxidation number of element grows (oxidation process).

Electron configuration of lithium is: ₃Li 1s²2s¹.

Electron configuration of potassium is: ₁₉K 1s²2s²2p⁶3s²3p⁶4s¹.

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