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Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

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BuyFindarrow_forward

Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
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hree elements have the electron configurations 1 s 2 2 s 2 2 p 6 3 s 2 ,  1 s 2 2 s 2 2 p 6 3 s 2 3 p 4 ,  and 1 s 2 2 s 2 2 p 6 3 s 2 3 p 2 . The first ionization energies of these elements (not in the same order) are 0. 59 0 ,   0. 999 . and   0. 738 MJ / mol . The atomic radii are 1 0 4 .  16 0 , and 197 pm . Identify the three elements, and match the appropriate values of ionization energy and atomic radius to each configuration. Complete the following table with the correct information.

l>

Electron Configuration

td>Element Symbol

td>First Ionization Energy (MJmol)

td>Atomic Radius PM

td>

msp;  1s 2 2 s 2 2 p 6 3 s 2

msp;  1 s 2 2 s 2 2 p 5 3 s 2 3 p 4

msp;  1 s 2 2 s 2 2 p 6 3 s 2 3 p 5 4 s 2

Interpretation Introduction

Interpretation:

On the basis of the electronic configuration, the three given elements are to be identified and their appropriate values of first ionization energies and atomic radii are to be matched.

Concept Introduction:

The distribution of the electrons that exists in the atomic orbital of an atom is collectively known as electronic configuration. The description of every electron in an orbital is given by the electronic configuration of that atom.

According to the periodic table, the ionization energy of the elements increases while moving left to right in the period due to decrease in the atomic size. On the other hand, the ionization energy of the elements decreases while going down the group due to increase in the atomic size of the elements.

Explanation

The first given electronic configuration is 1s22s22p63s2. According to this electronic configuration, the atomic number of the element is 12. The element that corresponds to the atomic number 12 is magnesium (Mg). The first ionization energy of magnesium is 0.738MJ/mol and its atomic radii is 160pm. Thus, the first element is identified as magnesium.

The second given electronic configuration is 1s22s22p63s23p4. According to this electronic configuration, the atomic number of the element is 16. The element that corresponds to the atomic number 16 is sulfur (S)

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