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Modern Periodic Table

The plot of s...

Question

The plot of square root of frequency of X-ray emitted against atomic number led to suggestion of which law/rule?

A

Periodic law

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B

Modern periodic law

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C

Hund's rule

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D

Newland's law

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Solution

The correct option is B Modern periodic law
Moseley gave modern periodic law. He showed that atomic number is more fundamental property of an element than its atomic mass as follows:

"The square root of the frequency of a line (of X-ray spectrum) is related to the atomic number $Z$ of the target material as,

$\sqrt{v} = a (Z - b)$

where, $a =$ proportionality constant
$Z =$ atomic number
$b =$ another constant

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