What is larger a metal atom or nonmetal atom in same period?

In the same period of the Periodic Table, metal atoms are generally larger than nonmetal atoms. This is because metal atoms have fewer protons and electrons, resulting in a weaker effective nuclear charge that allows their outer electrons to be further away from the nucleus. As you move across a period from left to right, the increasing nuclear charge pulls the electrons closer, causing nonmetals to have a smaller atomic radius compared to metals.