The chemical properties of the atom are determined by the number of protons, in fact, by number and arrangement of electrons.

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. Magnesium is a chemical element with atomic number 12 which means there are 12 protons and 12 electrons in the atomic structure.

K) 24.8 Thermal Conductivity 156 Specific Heat 1.02 Heat of Fusion 8.954 Heat of Vaporization 127.4 Atomic Number of Magnesium.Magnesium – Properties Element Magnesium Atomic Number 12 Symbol Mg Element Category Alkaline Earth Metal Phase at STP Solid Atomic Mass 24.305 Density at STP 1.738 Electron Configuration 3s2 Possible Oxidation States +2 Electron Affinity - Electronegativity 1.31 1st Ionization Energy 7.6462 Year of Discovery 1755 Discoverer Black, Joseph Thermal properties Melting Point 649 Boiling Point 1090 Thermal Expansion µm/(m

Mass no of magnesium