The following four spheres represent a metal atom,a nonmetal atom,a monatomic anion and a monatomic cation,not necessarily in that order.
-Which sphere represents the metal atom?

Question

The following four spheres represent a metal atom,a nonmetal atom,a monatomic anion and a monatomic cation,not necessarily in that order. 
-Which sphere represents the metal atom?

Quizplus · Accepted Answer

Metal atoms tend to lose electrons and form cations, which are positively charged ions. Sphere A is the only one with fewer electrons than protons, indicating a positive charge and therefore a cation.

The Following Four Spheres Represent a Metal Atom,a Nonmetal Atom,a