![]() ![]() This fact has key implications for the building up of the periodic table of elements. 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. 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. Option 4: Beryllium having atomic number 4. The periodic table is a tabular display of the chemical elements organized on the basis of their atomic numbers, electron configurations, and chemical properties. Electronic configuration of N It has 3 electrons in its p-orbital. 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. ![]() Option 3: Nitrogen having atomic number 7. In a neutral atom there are as many electrons as protons moving about nucleus. Electronic configuration of O It has 4 electrons in its p-orbital. ![]() The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10 -19 coulombs. Nitrogen lies to the right of the metalloid stairstep, so it is a nonmetal. The element is in the 15th group, so it is classified as a pnictogen (more commonly referred to as the nitrogen group or family). The valence shell electronic configuration of these elements is ns 2 np 3. Nitrogen, atomic symbol N, has an atomic number of seven and lies in period two on the periodic table, above phosphorous and left of oxygen. Nitrogen is one of the most electronegative atoms after fluorine ( F) and oxygen ( O ). Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. Nitrogen (N): Nitrogen is a p-block element having atomic number 7. 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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