Metalloid elements are a type of element that have properties of both metals and non-metals. One example of a metalloid element is BORON, which has 5 letters. BORON is a chemical element with the symbol B and atomic number 5. It is a nonmetal in the BORON group that is found in nature only as compounds, not as a free element. BORON is used in many industrial and commercial applications, such as in the production of glass and ceramics.