It is the Pauli exclusion principle that requires the electrons in an atom to occupy different energy levels instead of them all condensing in the ground state.
In the periodic table, the elements are listed in order of increasing atomic number Z. The number of electrons in each element’s electron shells, particularly the outermost valence shell, is the primary factor in determining its chemical bonding behavior. The configuration of these electrons follows from the principles of quantum mechanics. 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. K) - Thermal Conductivity 0.01772 Specific Heat 0.52 Heat of Fusion 1.188 Heat of Vaporization 6.447 Atomic Number of ArgonĪrgon is a chemical element with atomic number 18 which means there are 18 protons and 18 electrons in the atomic structure.Argon – Properties Element Argon Atomic Number 18 Symbol Ar Element Category Noble Gas Phase at STP Gas Atomic Mass 39.948 Density at STP 1.784 Electron Configuration 3s2 3p6 Possible Oxidation States 0 Electron Affinity - Electronegativity - 1st Ionization Energy 15.7596 Year of Discovery 1894 Discoverer Ramsay, Sir William & Strutt, John (Lord Rayleigh) Thermal properties Melting Point -189.2 Boiling Point -185.7 Thermal Expansion µm/(m
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