Question

The plot of the square root of the frequency of X-rays emitted against atomic number led to the suggestion of which law (rule)?

Options

• Periodic law

• Modern Periodic law

• Hund's rule

• Newland's law

Answer 1

Modern Periodic law

Explanation:

Moseley gave the modem periodic law. He showed that atomic number is a more fundamental property of an element than its atomic mass. He found that the square root of the frequency of a line (of an X-Ray spectrum) is related to the atomic number (Z) of the target material; as `sqrt"v"` = a(z − b).