Is the periodic table of the elements all of the atoms known to exist?

Why are people not able to skip a dive to the deepest part of the ocean

What is the chemical name of the compound na2co3? use the list of polyatomic ions and the periodic table to you answer. a. sodium carbon oxide b. sodium carbonate c. sodium(ll) carbonate d. sodium oxalate

How does kepler second law of planetary motion overthrow one of the basic beliefs of classical astronomy