Answered: Element Wavelength (Å) Ne 14.610 Ca…

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter34: Particle Size Determination

Section: Chapter Questions

Problem 34.2QAP

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Question

Moseley established the concept of atomic number by studying
X rays emitted by the elements. The X rays emitted by
some of the elements have the following wavelengths:(a) Calculate the frequency, n, of the X rays emitted by each
of the elements, in Hz. (b) Plot the square root of n versus
the atomic number of the element. What do you observe
about the plot? (c) Explain how the plot in part (b) allowed
Moseley to predict the existence of undiscovered elements.
(d) Use the result from part (b) to predict the X-ray wavelength
emitted by iron. (e) A particular element emits X rays with a
wavelength of 0.980 Å. What element do you think it is?

Element
Wavelength (Å)
Ne
14.610
Ca
3.358
Zn
1.435
Zr
0.786
Sn
0.491

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