FOR PHYSICAL SCIENCE (MIDTERM )

1. In______, while working at the University of Manchester, he observed and measured the X-ray
spectra of various chemical elements using diffraction in crystals.

• 1913

• 1915

• 1916

He discovered a systematic relation between wave- length and atomic number.

• Rurtherfurd

• Moseley

• thomson

It was an arbitrary quantity, the order of the elements as they appeared in the periodic table, but
without any physical meaning (before Moseley).

• atomic mass

• number of neutrons

• atomic number

Year moseley demonstrated with little room for quibbling that the X-ray wavelengths of his
elements varied according to the atomic number, and the atomic weight was irrelevant. Moseley
argued that atomic number is a better indicator of an element’s chemical properties than atomic
weight.

• 1915

• 1916

• 1913

Elements are ordered by their____

• x-ray frequencies

• frequencies

• nucleus size

• He also noticed that the frequency increased by a certain amount when the “positive charge”
of the chosen element was higher.

• Rutherford

• Dalton

• Moseley

_____ discovered that the wave-lengths of the X-rays from his assortment of metals varied in step
with something called Z, the atomic number. At that time, elements were identified by two
quantities–atomic weight, and atomic number.

• Dalton

• Moseley

• Rutherford

In 1913 Moseley used_____ work to advance the understanding of the elements and solve the
problem with Mendeleev’s periodic table.

• Rutherford’s work

• THOMSON’s work

• CHADWICK’s work

This discovery is now known as Moseley's Law. Who was a
researcher at Rutherford’s laboratory.

• TRUE

• FALSE

In 1913 Moseley used Rutherford’s work to advance the
understanding of the elements and solve the problem with
Mendeleev’s periodic table.

• TRUE

• FALSE