1. Why does the first ionisation energy of atoms generally increase across a period?
As you go across the period, the number of protons increases, however the amount of shielding stays the same, so attraction of outer electrons to nucleus increases and more energy is required to remove an electron. Hence the ionisation energy increases.
SA
Related Chemistry A Level answers
All answers ▸When vaporised, isotopes of an element can be separated in a mass spectrometer. Name the three processes that occur in a mass spectrometer before the vaporised isotopes can be detected. State how each process is achieved. (6 marks)
How does a mass spectrometer work?
Explain in detail what do you understand by catalyst, what makes them so useful and give two example of catalytic processes including the name catalyst used.
Why does the bromine become polarised in HBr during electrophilic addition