<Tr> <Td> Z </Td> <Td> 19 </Td> <Td> 20 </Td> <Td> 21 </Td> <Td> 22 </Td> <Td> 23 </Td> <Td> 24 </Td> <Td> 25 </Td> <Td> 26 </Td> <Td> 27 </Td> <Td> 28 </Td> <Td> 29 </Td> <Td> 30 </Td> <Td> 31 </Td> <Td> 32 </Td> <Td> 33 </Td> <Td> 34 </Td> <Td> 35 </Td> <Td> 36 </Td> </Tr> <Tr> <Td> 1s </Td> <Td> 18.490 </Td> <Td> 19.473 </Td> <Td> 20.457 </Td> <Td> 21.441 </Td> <Td> 22.426 </Td> <Td> 23.414 </Td> <Td> 24.396 </Td> <Td> 25.381 </Td> <Td> 26.367 </Td> <Td> 27.353 </Td> <Td> 28.339 </Td> <Td> 29.325 </Td> <Td> 30.309 </Td> <Td> 31.294 </Td> <Td> 32.278 </Td> <Td> 33.262 </Td> <Td> 34.247 </Td> <Td> 35.232 </Td> </Tr> <Tr> <Td> 2s </Td> <Td> 13.006 </Td> <Td> 13.776 </Td> <Td> 14.574 </Td> <Td> 15.377 </Td> <Td> 16.181 </Td> <Td> 16.984 </Td> <Td> 17.794 </Td> <Td> 18.599 </Td> <Td> 19.405 </Td> <Td> 20.213 </Td> <Td> 21.020 </Td> <Td> 21.828 </Td> <Td> 22.599 </Td> <Td> 23.365 </Td> <Td> 24.127 </Td> <Td> 24.888 </Td> <Td> 25.643 </Td> <Td> 26.398 </Td> </Tr> <Tr> <Td> 2p </Td> <Td> 15.027 </Td> <Td> 16.041 </Td> <Td> 17.055 </Td> <Td> 18.065 </Td> <Td> 19.073 </Td> <Td> 20.075 </Td> <Td> 21.084 </Td> <Td> 22.089 </Td> <Td> 23.092 </Td> <Td> 24.095 </Td> <Td> 25.097 </Td> <Td> 26.098 </Td> <Td> 27.091 </Td> <Td> 28.082 </Td> <Td> 29.074 </Td> <Td> 30.065 </Td> <Td> 31.056 </Td> <Td> 32.047 </Td> </Tr>

How the screening effect effective nuclear charge and the bare nuclear charge of an atom are related