Which is not true?
A. Mendeleev ended each row in his periodic table with an inert gas.
B. Mendeleev left gaps in his periodic table for undiscovered elements.
C. Mendeleev ordered the elements in his periodic table by atomic weight.
D. Mendeleev's periodic table predated the concept of electron configuration.
Answer:A
Which is not true?
A. Mendeleev ended each row in his periodic table with an inert gas. B. Mendeleev left gaps in his periodic table for undiscovered elements. C. Mendeleev ordered the elements in his periodic table by atomic weight. D. Mendeleev's periodic table predated the concept of electron configuration.