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Periodicity

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Question 5

The graph below shows the first ionisation energies of the Period 3 elements.

First ionisation energy graph

Which statement(s) about the periodic trends of Period 3 elements is/are correct?

  1. The first ionisation energy of sulfur is lower than that of phosphorus because of spin-pair repulsion in the 3p3\text{p}3p sub-shell of sulfur.
  2. The electronegativity of the elements increases across Period 3 from sodium to chlorine due to an increased nuclear charge and a similar shielding effect.
  3. Argon has a higher melting point than chlorine because of its larger atomic mass and greater number of electrons.

1, 2 and 3

Only 1 and 2

Only 1 and 3

Only 2 and 3

Periodicity Questions

  1. A Level
  2. /Chemistry
  3. /Periodicity