How many valence electrons do boron group elements have?

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A color-coded periodic table of the elements displays each element's symbol and atomic number, with categories such as alkali metals, noble gases, halogens, transition metals, and actinoid elements distinguished by different background colors. — boron group element Modern version of the periodic table of the elements (printable).

Every element in the boron group (Group 13 of the periodic table) has three valence electrons in its outermost shell.12

This configuration is a defining characteristic of the group, which includes boron, aluminum, gallium, indium, thallium, and nihonium. Because these three electrons are in the outermost part of the atomic structure, there is a significant increase in the energy required to remove a fourth electron, as that would necessitate breaking into an inner electron shell.21