Periodic Table of Elements - Metals, Metalloids, and Nonmetals Overview #3266653 (License: Personal Use)

This educational diagram presents the standard periodic table layout with elements grouped by atomic number, periods (rows), and groups (columns). It uses color-coded legend boxes to identify metals (light gray), metalloids (medium gray), and nonmetals (dark gray), emphasizing the classic staircase boundary separating metals from nonmetals. The table includes all main-group elements and transition metals, omitting lanthanides and actinides for clarity.

Used in chemistry education materials, online tutorials, and classroom handouts to teach elemental classification; targets students, teachers, and self-learners seeking foundational knowledge of the periodic table.