In the diagram below, the black circle represents the nucleus of the atom, and each circle represents the boundary of an electron shell. We can model the electronic structure of atoms as a series of concentric spheres, or shells, around the nucleus of an atom. protons = atomic number (Z)īut the atomic number (Z) only tells us how many electrons in total there are around the nucleus of a neutral atom, it doesn't directly tell us how those electrons are arranged around the nucleus. Therefore, the number of electrons in an atom of an element is equal to the element's atomic number (Z): The number of protons in the nucleus of an atom is equal to its atomic number (Z). That is, for an atom to be neutral (no overall charge), the number of negative charges (electrons) must be equal to the number of positive charges (protons). The number of electrons around the nucleus of each atom is equal to the number of protons in its nucleus. No ads = no money for us = no free stuff for you! Electron Shell Concept Electron configurations (electronic configurations) are written with number of electrons in lowest energy level (shell) first, separated by a comma from the number of electrons in the next energy level (shell), etc.L shell (2 nd energy level) can hold a maximum of 8 electrons. K shell (1 st energy level) can hold a maximum of 2 electrons.Electrons fill the lowest energy shells (energy levels) first. ![]() N is the 4 th energy level (higher energy than M shell) M is the 3 rd energy level (higher energy than L shell) L is the 2 nd energy level (higher energy than K shell) K is the 1 st energy level (lowest energy level) Electron shells correspond to energy levels:.Shells in order from closest to furthest from nucleus:.Shells are given the symbols K, L, M and N.An atom is represented as a nucleus surrounded by shells containing electrons.You need to become an AUS-e-TUTE Member! Periods 1 to 3 Atoms: Electron Configuration in Shells (energy levels) Chemistry Tutorial Key Concepts Want chemistry games, drills, tests and more? Shell Electron Configuration Periods 1 to 3 Atoms Chemistry Tutorial More Free Tutorials Become a Member Members Log‐in Contact Us
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