Explain Heisenberg's uncertainty principle. What paradox

Solution 18E Step 1 The electronic configurations for the elements are as follows Element Electronic configuration 2 2 6 2 Mg (z=12) 1s 2s 2p 3s P(z=15) 1s 2s 2p 3s 3p 3 K (z=19) 1s 2s 2p 3s 3p 4s 1 2 2 6 2 6 2 2 Ti(Z=22) 1s 2s 2p 3s 3p 3d 4s 2 2 6 2 6 10 2 6 8 1 Rh(Z=45) 1s 2s 2p 3s 3p 3d 4s 4p 4d 5s Hence all these elements have 1s 2s 2p configuration below n=3 shell.Hence the n=3 electrons are screened to the same extend in all these elements.