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CAIE A-Level Chemistry 1.4.6 Factors Affecting Ionisation Energy

Practise comparing ionisation energies through nuclear charge, radius, shielding, sub-shell energy and spin-pair repulsion.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • compare nuclear charge only after accounting for electron distance and shielding
  • use sub-shell energy and electron pairing to explain exceptions such as P versus S or N versus O
  • explain isotope equality in ionisation energy through equal proton number and electron configuration

1.4.6—Factors influencing the ionisation energies question 1

[Maximum number: 4]

Question (a)

(a)

Table 1 gives physical data for some of the Period 3 elements.

Table 1

Table 1

[ 4 ]

Question (i)

(i)

Explain the difference between the first ionisation energies of the elements with atomic numbers 11 and 17.

[ 2 ]

Question (ii)

(ii)

Explain the difference between the first ionisation energies of the elements with atomic numbers 15 and 16 .

[ 2 ]
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