bschaeffer

It seems that helium should be with hydrogen at the head of the periodic table because they are both of s type mode. This was showed since seventy years by Bohr, Pauli and others, but the chemists have not yet accepted it. They say that the periodic table should be based on chemical properties and not on quantum mechanics, an absurd or at least incomprehensible theory. Helium is usually falsely placed with the other rare gases which are of p type mode.