Organized by atomic number and properties, vital for chemistry and scientific predictions.
Each element shown with atomic number and atomic mass in its square.
Atomic number equals protons/electrons; atomic mass is protons plus neutrons.
Groups and Periods
Groups: Vertical columns with similar properties (e.g., noble gases in Group 18). Periods: Horizontal rows indicating electron orbits (e.g., Period 1 for Hydrogen and Helium).
– Includes 118 elements, 90 natural and others man-made. – Managed by IUPAC, with elements like Lithium and Uranium having notable properties.
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