Discover why ionization energy increases across a period in the periodic table, including atomic radius shrinkage, effective nuclear charge, shielding effects, and vital exceptions like Beryllium-Boron and Nitrogen-Oxygen with data tables.

Understand periodic table atomic size trends with plain-English explanations. Learn how atomic radius changes across groups & periods, key exceptions like lanthanide contraction, and real-world applications in battery tech and materials science.