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Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 7, Problem 2PS
Textbook Problem
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Write the electron configurations for Mg and Ar using both spdf notation and orbital box diagrams. Describe the relationship of the atom's electron configuration to its position in the periodic table.

Interpretation Introduction

Interpretation:

The Magnesium (Mg) and Argon (Ar) electronic configurations of has to be derived using its (spdf ) notation and orbital box diagram and also the relationship of atom’s electron configuration to its position has to be discussed.

Concept Introduction:

Electronic configuration: The electronic configuration is the distribution of electrons of an given molecule or respective atoms in atomic or molecular orbitals.

The important there rules for electronic configuration given below:

Aufbau principle: This rule statues that ground state of an atom or ions electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels. If consider the 1s shell is filled the 2s subshell is occupied.

Hund's Rule: The every orbital in a subshell is singly occupied with one electron before any one orbital is doubly occupied, and all electrons in singly occupied orbitals have the same spin.

Pauli exclusion rule: an atomic orbital may describe at most two electrons, each with opposite spin direction.

  1. 1. The electronic configuration of Magnesium (Mg) = 1s22s22p43s2 (or) [Ne]3s2
  2. 2. The general electronic configuration of Argon (Ar) = 1s22s22p43s23p6(or) [Ne]3s23p6

Explanation of Solution

  • According to periodic table, the magnesium (Mg) atom and its atomic number (12), It is the 12th element in the third period (n=3) and it is Group-3 of the S-block elements and it is an alkaline earth metals.

Hence this metal electron filling methods are shown below.

Let us consider following some points of the orbital notation method shown below.

  1. 1. In spdf and orbital box notations, assign 12 electrons of magnesium (Mg) to orbitals based on the order of filling.
  2. 2. The noble gas notation: The first (10) electrons are identified by the symbol of the (Ne) it is a one of noble gas. The remaining (2) electrons are assigning to the 3s outer-shells. Hence the Hund’s rule is fallowed in the box notation.

  AtomicnumberofMagnisium(Mg)=12Complete (spdf)notationof=1s22s22p63s2Orbital filling method=1s22s22p63s2spdfwith noble gas notation=[Ne]3s3Orbitalboxnotation       = [Ne]3s2

  • The argon (Ar) electronic configuration method is discussed below.

According to periodic table, the argon gas (Ar) and its atomic number (18), it is third period (n=3) and it is in the 18 column (Group-18, noble gases are completely filled).

  1. 3. The spdf and orbital box notations, assign the (18) electrons for argon (Ar) to orbitals based on the order of filling.
  2. 4. The noble gas notation: The first 10 electrons are identified by the symbol of the Ne, it is one of the noble gas. The remaining 8 electrons are assigning to the 3s and 3p sub-shells. Hence, the Hund’s rule is followed in the box notation

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Chapter 7 Solutions

Chemistry & Chemical Reactivity
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