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CAIE A-Level Chemistry 1.4.8 Periodic Table Position from IE Data

Practise extracting group, period and block evidence from successive ionisation energies without over-interpreting the graph.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • infer group from the number of electrons removed before the first very large ionisation-energy jump
  • infer period from the number of occupied electron shells when enough configuration evidence is supplied
  • use block or stated period clues to narrow the position rather than naming an unsupported element

1.4.8—Periodic Table position from IE data question 1

[Maximum number: 2]

In the Periodic Table, the p block contains elements whose outer electrons are found in the p subshell.

Elements in the p block show a general increase in first ionisation energy as the atomic number increases.

Element A is in the p block.

The graph shows the successive ionisation energies for the removal of the first ten electrons of A.

Figure for Question 1.4.8—Periodic Table position from IE data question 1 — CAIE A-Level Chemistry AS

State and explain the group of the Periodic Table that element A belongs to. group number
explanation

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