For metalloids on the periodic table, how do the group number and the period number relate?

Which of these properties is the best one to use for the identification of an element?

Of the elements Pt, V, Li, and Kr, which is a nonmetal?

Which groups of the modern periodic table contain elements that are classified as metalloids?

How to test a sample of an element to see if it is a metal

Which list of elements contains a metal, a metalloid, and a nonmetal?

Which are elements that have the physical and chemical properties of both metals and nonmetals?

What types of atoms form cations? Where are they located on the periodic table?