When Mendeleev developed his periodic table, he placed the greatest emphasis on
A. the atomic number of the elements.
B. putting elements with similar properties in the same column.
C. leaving no holes or blank spaces in the table.
D. the melting points of the elements.
Answer:B
When Mendeleev developed his periodic table, he placed the greatest emphasis on
A. the atomic number of the elements. B. putting elements with similar properties in the same column. C. leaving no holes or blank spaces in the table. D. the melting points of the elements.