MCQ Quiz — History of the Periodic Table

Who proposed the concept of triads in the periodic classification of elements?

• John Newlands

• Dmitri Mendeleev

• Johann Wolfgang Dobereiner

• Glenn T. Seaborg

In Dobereiner’s triads, the atomic mass of the middle element is:

• Double the first element

• Equal to the first element

• Approximately the mean of the other two

• Half the last element

Which of the following is a Dobereiner triad of alkali metals?

• Li, Na, K

• Na, K, Rb

• Li, Be, B

• K, Rb, Cs

Which triad includes calcium, strontium, and barium?

• Halogen triad

• Alkaline earth triad

• Alkali metal triad

• Transition metal triad

Which was a limitation of Dobereiner’s triads?

• Could not arrange noble gases

• Could only arrange metals

• Only a few triads existed and many elements didn’t fit

• Could not classify synthetic elements

Who gave the Law of Octaves in 1864–65?

• Dmitri Mendeleev

• John Newlands

• Henry Moseley

• William Ramsay

According to Newlands, every ____ element had similar properties.

• 5th

• 6th

• 8th

• 10th

Newlands arranged elements in order of:

• Atomic number

• Atomic mass

• Density

• Valency

Which of the following was a drawback of Newlands’ law?

• Could not arrange synthetic elements

• Grouped dissimilar elements together

• Could not arrange metals

• Ignored isotopes

Which element has similar properties to Lithium according to Newlands’ law?

• Magnesium

• Sodium

• Calcium

• Aluminium