<Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <Tr> <Td> </Td> <Td> f </Td> <Td> f </Td> <Td> f </Td> <Td> f </Td> <Td> f </Td> <Td> f </Td> <Td> f </Td> <Td> f </Td> <Td> f </Td> <Td> f </Td> <Td> f </Td> <Td> f </Td> <Td> f </Td> <Td> f </Td> <Td> d </Td> <Td> d </Td> <Td> d </Td> <Td> d </Td> <Td> d </Td> <Td> d </Td> <Td> d </Td> <Td> d </Td> <Td> d </Td> <Td> d </Td> <Td> p </Td> <Td> p </Td> <Td> p </Td> <Td> p </Td> <Td> p </Td> <Td> p </Td> <Td> s </Td> <Td> s </Td> </Tr> <Tr> <Td> 1s </Td> <Td_colspan="30"> </Td> <Td> </Td> <Td> He </Td> </Tr> <Tr> <Td> 2s </Td> <Td_colspan="30"> </Td> <Td> Li </Td> <Td> Be </Td> </Tr>

Based on the periodic table which two elements have the most similar number of protons