History of the Periodic Table

The idea of "triads" of elements with similar properties was due to

• John Newlands

• Johann Dobereiner

• Dmitri Mendeleev

• Henry Moseley

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In a chemical "triad", the masses of the three elements were related by the fact that

• the masses of the three were all the same

• their masses added up to 100%

• the average of the masses of the outer two equaled the middle one

• their masses were all unknown

Which of the following groups of elements could NOT be a triad?

• Cl, Br, I

• C, N, O

• Li, Na, K

• Ca, Ba, Sr

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The "Law of Octaves" was the brainchild of

• Glenn Seaborg

• Lothar Meyer

• Johann Dobereiner

• John Newlands

The "Law of Octaves" stated that

• The properties of the elements repeated every eighth element when arranged by their atomic mass

• Elements could be classified in groups of three based on their mass and properties

• The properties of the elements repeated of a regular basis when arranged by their atomic number

• doubling the frequency of a tone raises its pitch by an octave

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Which of the following is NOT a reason that the law of octaves failed?

• It didn't work for elements past calcium

• There was no provision for undiscovered elements

• It didn't explain similar properties of any elements

• Elements with very dissimilar properties were put into the same column

The first usable modern periodic table was developed by

• Dmitri Mendeleev

• Glenn Seaborg

• John Newlands

• Johan Dobereiner

Which of the following was NOT a reason that Mendeleev was given credit for the first periodic table rather than Lothar Meyer?

• Mendeleev published first

• Meyer didn't leave spaces for undiscovered elements

• Mendeleev corrected the mass of many elements

• Mendeleev classified anomalous elements by their properties rather than their mass

Why was Henry Moseley responsible for solving the mystery of the anomalous elements on the periodic table?

• He corrected the mass of those elements

• He corrected the properties of those elements

• He discovered the electron

• He discovered atomic number

Glenn Seaborg gave us the final revision of the periodic table when he suggested that certain elements belonged in the

• d block

• actinide series

• lanthanide series

• other metals

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