Explain why the second ionisation energy of Magnesium is lower than the second ionisation energy of Sodium.
For the 2nd IE of Na an electron is being removed from the 2p subshell.For the 2nd IE of Mg an electron is being removed from the 3s subshell.It requires more energy to remove an electron from a lower energy shell. The shielding on the electron is greater in Mg+.
NR
Related Chemistry A Level answers
All answers ▸An unknown gas from a reaction is contained in a 2 litre beaker, at standard atmospheric pressure and a Temperature of 25 Celsius. Calculate the number of moles of the gas.
A solution of ethanoic acid in water has a concentration of 3 g/dm^3. Given that the pKa of ethanoic acid is 4.76, calculate the pH of this solution.
Define the term enthalpy of reaction
What is the difference between an isotopic and isoelectronic species?