10 Questions
What did Johann Dobereiner discover about the elements in a triad?
They had similar chemical properties
What did Henry Moseley use to determine the number of protons in the nucleus of an atom?
X-rays
Who isolated potassium and sodium?
Humphry Davy
What did Robert Boyle state about an element?
It cannot be split into simpler substances by chemical means
Why did Dmitri Mendeleev leave gaps in his periodic table?
He predicted the properties of yet to be discovered elements
What did John Newlands discover about the eighth element?
It had similar properties to the first element
Which scientist developed the concept of triads, where the atomic weight of the middle element is halfway between the other two elements?
Johann Dobereiner
What was the basis of arrangement of elements in the periodic table developed by Henry Moseley?
Atomic number
What was the contribution of Humphry Davy to the development of the periodic table?
Isolation of potassium and sodium
Which ancient civilization believed that there were only four elements?
Ancient Greeks
Learn about the development of the periodic table, from John Newlands' Law of Octaves to Dmitri Mendeleev's arrangement of elements by atomic weight. Discover the key scientists and concepts behind this fundamental chemistry tool.
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