Which Group 13 elements are metals?

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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).

Within the boron group (Group 13), the elements classified as metals are:

Aluminum (Al)
Gallium (Ga)
Indium (In)
Thallium (Tl)

These four elements are characterized as silvery white metals.1

In contrast, the lightest member of the group, boron, is classified as a metalloid, while nihonium is a synthetic element produced only as individual atoms in particle accelerators.1