Examine the ratio of atomic mass to atomic number forthe elements with even atomic number through calcium.This ratio is approximately the ratio of the average massnumber to the atomic number.(a) Which two elements stand out as different in this setof ten?(b) What would be the "expected" atomic mass of argon,based on the correlation considered here?(c) Show how the anomaly in the ordering of naturalatomic masses of argon and potassium can beaccounted for by the formation of “extra" 40 Ar viadecay of 4°K atoms.

Answered: Examine the ratio of atomic mass to…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

Examine the ratio of atomic mass to atomic number for
the elements with even atomic number through calcium.
This ratio is approximately the ratio of the average mass
number to the atomic number.
(a) Which two elements stand out as different in this set
of ten?
(b) What would be the "expected" atomic mass of argon,
based on the correlation considered here?
(c) Show how the anomaly in the ordering of natural
atomic masses of argon and potassium can be
accounted for by the formation of “extra" 40 Ar via
decay of 4°K atoms.

Expert Solution

Step 1

Ratio of atomic mass to atomic number for the elements with even atomic number

$\begin{array}{rcl} R a t i o & = & a t o m i c m a s s / a t o m i c n o . \\ H e : 4 / 2 & = & 2 \\ B e : 8 / 4 & = & 2 \\ C : 12 / 6 & = & 2 \\ O : 16 / 8 & = & 2 \\ N e : 20 / 10 & = & 2 \\ M g : 24 / 12 & = & 2 \\ S i : 28 / 14 & = & 2 \\ S : 32 / 16 & = & 2 \\ A r : 40 / 18 & = & 2.22 \\ C a : 40 / 20 & = & 2 \end{array}$