Chemistry
(a) Name an element whose properties were predicted on the basis of its position in Mendeleev's periodic table.
(b) Name two elements whose atomic weights were corrected on the basis of their positions in Mendeleev's periodic table.
(c) How many elements were known at the time of Mendeleev's classification of elements?
Related Questions
The atomic number of an element is more important to the chemist than its relative atomic mass. Why?
Consider the following elements: Be, Li, Na, Ca, K. Name the elements of (a) same group (b) same period.
(a) State the modern periodic law.
(b) How many periods and groups are there in the modern periodic table?
What is the main characteristic of the last element in each period of the Periodic Table? What is the general name of such elements?