Which element of group 3A behave as a nonmetal or semimetal?
You're probably thinking ob boron.
To determine which element in Group 3A behaves as a nonmetal or semimetal, we need to refer to the periodic table. Group 3A, also known as Group 13, consists of elements such as boron (B), aluminum (Al), gallium (Ga), indium (In), and thallium (Tl).
First, let's analyze boron (B) and aluminum (Al). Both elements are located towards the left side of the group. Boron is a metalloid, which means it exhibits properties of both metals and nonmetals, but it is generally considered a nonmetal. Aluminum, on the other hand, is considered a metal. Therefore, neither boron nor aluminum can be identified as a nonmetal or semimetal.
If we move further down Group 3A, we have gallium (Ga), indium (In), and thallium (Tl). These elements are located towards the right side of the group and tend to exhibit more nonmetallic properties.
Indium (In) and thallium (Tl) are both metals, so they can be excluded as options. However, gallium (Ga) is considered a metal in the periodic table, but it exhibits some behavior similar to nonmetals, such as low melting and boiling points.
Therefore, gallium (Ga) can be considered as the element in Group 3A that behaves as a semimetal or a nonmetal.