Predicting How Elements Behave

The video explores the development of the periodic table by Dmitri Mendeleev, who arranged elements by atomic weight and predicted undiscovered elements. The modern table uses atomic numbers, but Mendeleev's principles remain. It explains periodic trends like atomic radius and ionization energy, and how valence electrons determine element groups. The octet rule helps predict element bonding, using examples like oxygen, carbon, sodium, and chlorine. Mendeleev's work aids in understanding chemical and physical properties of elements.

Describe the trend in atomic radius and ionization energy as you move across a period in the periodic table.

How do the properties of elements in the same group of the periodic table compare?