<Tr> <Td> 12 </Td> <Td> Magnesium </Td> <Td> 2, 8, 2 </Td> <Td> </Td> </Tr> <Tr> <Td> 13 </Td> <Td> Aluminium </Td> <Td> 2, 8, 3 </Td> <Td> 13 </Td> </Tr> <Tr> <Td> 14 </Td> <Td> Silicon </Td> <Td> 2, 8, 4 </Td> <Td> 14 </Td> </Tr> <Tr> <Td> 15 </Td> <Td> Phosphorus </Td> <Td> 2, 8, 5 </Td> <Td> 15 </Td> </Tr>

How many electrons in the 4th energy level