When Mendeleev made the periodic table, the number of elements discovered till then were __.
When Mendeleev made the periodic table the number of elements discovered till then were 63. Rest were discovered later, and were added consecutively.
When Mendeleev made the periodic table, the number of elements discovered till then were ___.
The three elements predicted by Mendeleev from the gaps in his periodic table were known as eka-boron, eka-aluminium and eka-silicon. What names were given to these elements when they were discovered later on?