Скачать или смотреть Chem 10 - Chapter 5 Periodic Trends

The periodic table contains a lot of information and we are spending the course uncovering these pieces of information. This lecture will teach you how to draw Bohr models of the atom and how to use the periodic table to understand trends in valence electrons, atomic size, ionization energy, and electronegativity. Valence electrons, electrons in the highest energy level, are related to the group number of the element and determine the chemical properties of an element. A Lewis-dot symbol indicates the number of valence electrons as dots around the symbol of the element and will be used in later lectures for chemical bonding. The atomic radius is half the distance across an atom. Ionization energy is the energy it takes to remove a valence electron. Electronegativity– the ability of an element to attract electrons.