化学键合：基本概念

The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their …

The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number …

Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it …

The amount of energy required to remove the most loosely bound electron from a gaseous atom in its ground state is called its first ionization energy …

The electron affinity (EA) is the energy change for adding an electron to a gaseous atom to form an anion (negative ion). This process can be either …

Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the …

Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. …

The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were …