This fact has key implications for the building up of the periodic table of elements. Nitrogen is the chemical element with the symbol N and atomic number 7. The ordering of the electrons in the ground state of multielectron atoms, starts with the lowest energy state (ground state) and moves progressively from there up the energy scale until each of the atom’s electrons has been assigned a unique set of quantum numbers. 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. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. In the periodic table, the elements are listed in order of increasing atomic number Z. Element Nitrogen (N), Group 15, Atomic Number 7, p-block, Mass 14.007. 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. Nitrogen has 2 electrons in the first shell and the remaining 5 electrons in the second shell. The first electron shell can accommodate 2 electrons and the second electron shell can accommodate 8 electrons. The chemical properties of the atom are determined by the number of protons, in fact, by number and arrangement of electrons. 14) Nitrogen has an atomic number of 7 therefore, it has electrons in its outermost electron shell. 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. The periodic table is a tabular display of the chemical elements organized on the basis of their atomic numbers, electron configurations, and chemical properties. It is the electrons that are responsible for the chemical bavavior of atoms, and which identify the various chemical elements. Nitrogen Atomic Number: 7: Symbol: N: Element Category: Non Metal: Phase at STP: Gas: Atomic Mass amu 14.0067: Density at STP g/cm3 1.251. 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.
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