The metalloid which has 3 valance electrons is [tex]\boxed{{\text{boron}}}[/tex].
Further explanation
A periodic table is a systematic arrangement of elements in different rows and columns. In periodic table, elements are organised in the order of increasing atomic number such that elements with same chemical and physical properties lie in same group. Horizontal rows are called periods, and vertical columns are called groups.
Within a periodic table, elements are further classified as metals, nonmetals, and metalloids. The elements placed at the left side of the table are called metals and the elements placed at the right of the table are called nonmetals. Between metals and nonmetals, certain elements are placed called metalloids that separate metals from nonmetals.
The general electronic configuration of the element present in the 13th group of the periodic table is [tex]{\text{n}}{s^2}{\text{n}}{p^1}[/tex].
Therefore, the number of valence electrons of the group 13this 3. Also, the metalloid element which is present in group 13th is boron. Hence the metalloid which has 3 valance electrons is boron.
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Answer details:
Grade: High school
Subject: Chemistry
Chapter: Periodic table
Keywords: metalloids, three valance electrons, elements, group 13th, periodic table, boron, aluminum, gallium, indium, thallium.
