Organic Chemistry (8th Edition)

Published by Pearson

Chapter 1 - Introduction and Review - Problems: Problem 1-1 b

Answer

Na: $1s^{2}$ $2s^{2}$ $2p^{6}$ $3s^{1}$ Mg: $1s^{2}$ $2s^{2}$ $2p^{6}$ $3s^{2}$ Al: $1s^{2}$ $2s^{2}$ $2p^{6}$ $3s^{2}$ $3p^{1}$ Si: $1s^{2}$ $2s^{2}$ $2p^{6}$ $3s^{2}$ $3p^{2}$ P: $1s^{2}$ $2s^{2}$ $2p^{6}$ $3s^{2}$ $3p^{3}$ S: $1s^{2}$ $2s^{2}$ $2p^{6}$ $3s^{2}$ $3p^{4}$ Cl: $1s^{2}$ $2s^{2}$ $2p^{6}$ $3s^{2}$ $3p^{5}$ Ar: $1s^{2}$ $2s^{2}$ $2p^{6}$ $3s^{2}$ $3p^{6}$

Work Step by Step

Aufbau's principle is used to determine which orbital will be filled next. Each S orbital can hold only 2 electrons and p orbital can hold only 6 electrons. So as one orbital is filled, the electrons occupy the next orbital . Orbital 3s gets filled after Mg. As the next energy level is 3p and p can hold 6 electrons the electrons start filling p orbital, till it gets completely filled (Ar electronic configuration).

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