I do not uderstand the meaning of Eka - Boron . What is the meaning of Eka?
Well, we owe this term to old Mendeleev......
Well, you know that when Mendeleev initially published the Periodic Table (1869), he was astute enuff to realize that not all of the elements had been characterized or identified. He accounted for apparent gaps in his then Table, by using the prefixes
See this site for a (free!) article detailing Periodicity. There is probably much more information here than you need.
Just as a note that you might find amusing, when you read a detective novel, sometimes the crim uses an alias, and the detectives refer to him as