How does the organization of the modern periodic table differ from Mendeleev's original periodic table?
The modern table is ordered by increasing atomic number, whereas Mendeleev's was ordered mainly by relative atomic mass.
The modern table is ordered by the number of neutrons, whereas Mendeleev's was ordered by the number of protons.
The modern table is ordered by decreasing atomic mass, whereas Mendeleev's was ordered by increasing atomic mass.
The modern table is ordered by the melting points of elements, whereas Mendeleev's was ordered by density.
77 exam-style questions on OCR GCSE Chemistry Atomic structure. Each one has a worked solution and a mark scheme showing where the marks go.