good day everyone sir got it here i will help you to learn and explore the majestic and interesting world of science [Music] hello grade 9 learners once again we are here for another video lecture tutorial for our science class this video lecture will provide you a recap on writing an electron configuration and it will also serve as a preparation for the topic on understanding the quantum number which is present on melt number six of science nine are you ready to learn on how to write electron configuration of an element if yes let's start our session electron configuration is the arrangement of electrons in energy levels around an atomic nucleus further it is the shorthand representation and how each electron is arranged among the orbitals levels and sub levels usually satinatavagnating electron configuration i represented the numbers letters at superscript the number correspond to the principal quantum number whereas it designates the energy level of each atomic orbitals in which the electron moves the letter presented on the electron configuration represents the different orbitals or sub levels [Music] of levels [Music] p p for principal d for diffuse and f for fundamental superscript represents the number of electrons that can be accommodated in a particular sub-level [Music] on baghdad sub-level i made maximum number of electrons [Music] level can accommodate with the maximum number of two electrons p sub level can accommodate with the maximum number of six electrons the sublevel can accommodate with the maximum number of 10 electrons and lastly the f sub level can accommodate with the maximum number of 14 electrons [Music] [Music] [Music] [Music] maximum capacity [Music] [Music] [Music] [Music] [Music] [Music] we are going to determine the atomic number of the element that we are going to use for us to determine the atomic number of an element we are going to use the periodic table of elements using the table of elements we know that the atomic number of an element is always presented on the upper portion of the element symbol just like this means atomic numbers upper right or upper left portion and element symbol depends [Music] [Music] gamete and periodic table microsite ios associated step step two we are going to use the electron configuration mnemonics device for us to know the proper arrangement of the energy sub levels mnemonics device nato open sabbah orbitals or sub-levels element [Music] steps in writing the electron configuration there are three rules or principles that we need to follow this serves as a guide for writing the electron's location to be easily predicted the first principle is what we call afbao principle afbao is a german word which means built up this principle states that the electrons fill first the first orbital of the lowest energy until any added electrons occupy the available orbital of higher energy ebik the second principle netinatawagnating poly's exclusion principle it states that no more than two electrons in an atom can occupy an orbital further the pair of electrons must spin in opposite directions mapapansinaten is about what sub levels ito i'm a respective number of electrons [Music] exclusion principle according to this principle electrons are said to be paired if two electrons with opposite speeds occupy an orbital and unpaired if a single electron is present in the orbital [Music] nabata is a maximum number of electrons sub levels [Music] [Music] [Music] number of electrons in the sub-level f sub-level number of orbitals at the maximum number of electrodes [Music] it states that for a set of orbitals electrons occupy orbitals of equal energy electrons enter each orbit until all orbitals contains one electron with parallel spin nakitanat and zapoli's exclusion principle orbit electrons and [Music] a number of electrons using a representation of array facing upwards atapus nating ma a pair of electrons i'm a [Music] [Music] or not attractive suppressants magnetic field orbital i may present unpaired electrons element number one attracted to the presence of magnetic field at kapagang orbitals naman i filled with paired electrodes guyanas elements number two [Music] [Music] [Music] [Music] screen [Music] electrons a maximum number of six electrons [Music] automatically the number of electrons a superscript i indeed and total distribution of electron sabawa sub levels or orbitals i equal dapat's atomic number the hill nantinotal nathan and kasalokuyang distribution of electrons [Music] 1s2 2s2 2p6 3s2 3p1 and distribution electrons or human numbers form as superscript atomic number [Music] [Music] level [Music] [Music] to summarize this video lecture electron configuration refers to the shorthand representation on how each electron is arranged among the orbitals levels and sublevels each levels have respective number of maximum electrons that can accommodate and s i made the long maximum number of electrons and p i mianim the maximum number of electrons and d i may sample maximum number of electrons samantha and f i may 14 maximum number of electrons but the thing demands a number of orbitals and s i may sound orbital and p i made that long orbitals and d i my limit orbitals at nf aimepitom orbitals in the distribution of electrons we follow three principles first principle is what we call the akbao principle it means building up which came from a german word we need to start on the lowest energy level before we proceed to the higher level the second principle is what we call poly's exclusion principle it states that no more than two electrons in an atom can occupy an orbital ibxabihin solo is an orbital or box as a representation i'm a pair of electrons lama or hindi ki high the third principle is what we call the hans rule electrons can occupy orbitals of equal energy [Music] which is it is being affected with the presence of magnetic fields [Music] magnetic field [Music] [Music] [Music] with atomic number 15. [Music] principles [Music] electron configuration and phosphorus i 1s2 [Music] [Music] [Music] energy [Music] now let us proceed on the second item oxygen with atomic number 8 [Music] finds up an oxygen mai electron [Music] [Music] [Music] again i am sir gareth and let us learn and explore the majestic and interesting world of science