Explain why the atomic radii of the elements decrease across Period 3 from sodium to chlorine
As you go across the period from sodium to chlorine, the number of protons in the nucleus increase.As protons are positively charged, they attract the outer electrons; as the number of protons increase, the attraction is greater and therefore the radius decreases.
EC
Related Chemistry A Level answers
All answers ▸What is meant by the term amphoteric? and give an example of a reaction using NaOH that could be used to distinguish between a solution of amphoteric AlCl3 and non-amphoteric MgCl2.
How would you expect the H-NMR spectrum of ethanol to differ from the H-NMR spectrum of ethane?
Why can endothermic reactions occur spontaneously if the entropy change is negative for a cooling process?
At room temperature and pressure, the first 4 alkanes are all gases, but the first 4 alcohols are all liquids. Explain this.