Describe the ideas of Dobereiner, Newlands and Mendeleev

Q1: Newlands and Mendeleev placed elements in order of their:

Not quite - protons hadn't been discovered yet!
Well done!
Not quite - re-read the information page.


Descrobe the ideas of Newlands, Dobereiner and Mendeleev

Q2: All three fathers of the periodic table tried to group elements according to their:

Afraid not - look at the revision flashcard.
Well done! Aluminium is a group 3 element.
Incorrect - physical proeprties were also used.


Explain why the ideas of Dobereiner, Newlands and Mendeleev were rejected

Q3: Newlands' and Dobereiner's ideas were rejected mainly because:

Incorrect - they didn't suspect that there were undiscovered elements.
Incorrect - this is true only for Newlands. It's not the main reason because scientific theories should work for all known situations


Explain why the ideas of Dobereiner, Newlands and Mendeleev were rejected

Q4: Which of the following statements is true.

Afraid not - atomic number was discovered for another 70 years or so!
Inocrrect. Mendeleev swapped elements around where it made sense to do so. Find out about iodine and tellurium back on the main page.


Explain how testing a prediction lead to the acceptance of Mendeleev's ideas

Q5: The discovery of gallium and germanium proved Mendeleev correct because:

Incorrect - atomic number wouldn't be discovered until long after.
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