1.12 Electron Configuration_MD - CHM 1045 Names Delgado...

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Chapter 2 / Exercise 016
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CHM 1045 Delgado Names: Electron Configuration Learning Objectives x Learn different methods of distributing electron in an atom x Know how to write the electrons configuration of atoms and ions x Learn to identify type of orbitals where electrons are located Based on the previous models it was found that electrons are located in different energy levels. But how are they distributed? There are some basic rules to follow: x Aufbau Principle states that electrons are added up from the lowest energy level towards higher energy level. x Hund’s rule of maximum multiplicity states that when facing orbitals of same energy level ( degenerate orbitals) electrons fill them singly first aligned in the same direction ( same spin ) before pairing up with opposite spin. x Pauli’s Exclusion Princi ple states that an orbital can only be occupied by two electrons with opposite spin . As we move away from the nucleus into higher energy levels more orbitals are available for filling up. So far the elements in the periodic table use four types of orbitals identified by the letters: s, p, d, and f . Electrons are identified by their spin represented as a single arrow facing up or down, ↑ ↓ when placed in an orbital. Model 1: The diagram continues as shown: Model 2: Use the periodic table to predict electronic configuration.
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Chemistry: Principles and Practice
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Chapter 2 / Exercise 016
Chemistry: Principles and Practice
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