Low ionization energies are most characteristic of atoms that are

Low ionization energies are most characteristic of atoms that are metals, I believe.

Low ionization energies are most characteristic of atoms that are Metals

Metals tend to lose electrons in chemical reactions, as indicated by their low ionization energies. Ionization energy is the quantity of energy that an isolated, gaseous atom in the ground electronic state must absorb to discharge an electron, resulting in a cation. In metals the valence electrons are farther away from the positively charge nucleus, so the force of attraction is low therefore metals have low ionization energy.

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alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.