How does the ionisation energy differ across period 2 from Li to Ne?
The ionisation energy across a period increases as the effective nuclear charge increases but the shielding stays the same.
Effective nuclear charge= the electrostatic 'pull' that an electron 'feels' from a proton in the nucleus, this can be decreased by the shielding from other electrons (as the two negative charges repel one another).
HG
Related Chemistry A Level answers
All answers ▸Explain and draw the mechanism of the nucleophillic substitution reaction between bromoethane and aqueous sodium hydroxide. How is this reaction different to the elimination reaction which may occur?
Why does boiling point decrease down group 1 in the periodic table? [3 marks]
Explain the trend in first ionisation energies across a period.
Without calculation, predict (giving you reasoning) whether the entropy change for the following reaction will be significantly positive, significantly negative or approximately zero: MgO(s) + CO2 (g) --> MgCO3 (s)