<Tr> <Td> 2s </Td> <Td> 27.157 </Td> <Td> 27.902 </Td> <Td> 28.622 </Td> <Td> 29.374 </Td> <Td> 30.125 </Td> <Td> 30.877 </Td> <Td> 31.628 </Td> <Td> 32.380 </Td> <Td> 33.155 </Td> <Td> 33.883 </Td> <Td> 34.634 </Td> <Td> 35.386 </Td> <Td> 36.124 </Td> <Td> 36.859 </Td> <Td> 37.595 </Td> <Td> 38.331 </Td> <Td> 39.067 </Td> <Td> 39.803 </Td> </Tr> <Tr> <Td> 2p </Td> <Td> 33.039 </Td> <Td> 34.030 </Td> <Td> 35.003 </Td> <Td> 35.993 </Td> <Td> 36.982 </Td> <Td> 37.972 </Td> <Td> 38.941 </Td> <Td> 39.951 </Td> <Td> 40.940 </Td> <Td> 41.930 </Td> <Td> 42.919 </Td> <Td> 43.909 </Td> <Td> 44.898 </Td> <Td> 45.885 </Td> <Td> 46.873 </Td> <Td> 47.860 </Td> <Td> 48.847 </Td> <Td> 49.835 </Td> </Tr> <Tr> <Td> 3s </Td> <Td> 21.843 </Td> <Td> 22.664 </Td> <Td> 23.552 </Td> <Td> 24.362 </Td> <Td> 25.172 </Td> <Td> 25.982 </Td> <Td> 26.792 </Td> <Td> 27.601 </Td> <Td> 28.439 </Td> <Td> 29.221 </Td> <Td> 30.031 </Td> <Td> 30.841 </Td> <Td> 31.631 </Td> <Td> 32.420 </Td> <Td> 33.209 </Td> <Td> 33.998 </Td> <Td> 34.787 </Td> <Td> 35.576 </Td> </Tr> <Tr> <Td> 3p </Td> <Td> 21.303 </Td> <Td> 22.168 </Td> <Td> 23.093 </Td> <Td> 23.846 </Td> <Td> 24.616 </Td> <Td> 25.474 </Td> <Td> 26.384 </Td> <Td> 27.221 </Td> <Td> 28.154 </Td> <Td> 29.020 </Td> <Td> 29.809 </Td> <Td> 30.692 </Td> <Td> 31.521 </Td> <Td> 32.353 </Td> <Td> 33.184 </Td> <Td> 34.009 </Td> <Td> 34.841 </Td> <Td> 35.668 </Td> </Tr>

What is the difference between effective nuclear charge and nuclear charge