Which statements accurately describe Dmitri Mendeleev’s contributions to the development of the periodic table? Check all that apply.

Question

Mendeleev wrote the first modern chemistry textbook.
Mendeleev produced the first orderly arrangement of known elements.
Mendeleev ordered the elements by increasing atomic number.
Mendeleev used patterns to predict undiscovered elements.
Mendeleev accounted for variations resulting from isotopes.

Answer 1

Mendeleev produced the first orderly arrangement of known elements.
Mendeleev used patterns to predict undiscovered elements.

Answer 2

Which scientist arranged the elements in order of increasing atomic number, rather than increasing atomic mass?

Antoine Lavoisier
Dmitri Mendeleev
Henry Moseley
John Newlands