See also: Atomic Number – Does it conserve in a nuclear reaction? Atomic Number and Chemical PropertiesĮvery solid, liquid, gas, and plasma is composed of neutral or ionized atoms. It is the electrons that are responsible for the chemical bavavior of atoms, and which identify the various chemical elements. In a neutral atom there are as many electrons as protons moving about nucleus. The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10 -19 coulombs. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. The nucleus is composed of protons and neutrons. The atom consist of a small but massive nucleus surrounded by a cloud of rapidly moving electrons.
Chlorine – Properties Element Chlorine Atomic Number 17 Symbol Cl Element Category Halogen Phase at STP Gas Atomic Mass 35.453 Density at STP 3.214 Electron Configuration 3s2 3p5 Possible Oxidation States +1,5,7/-1 Electron Affinity 349 Electronegativity 3.16 1st Ionization Energy 12.9676 Year of Discovery 1774 Discoverer Scheele, Carl Wilhelm Thermal properties Melting Point -101 Boiling Point -34.6 Thermal Expansion µm/(m
