First ionisation energy of Li and K are 5.4 and 4.3 eV respectively

CHEMISTRY · Single correct · A Level · Chemistry · Periodicity and periodic trends · Periodicity and periodic trends

Problem

First ionisation energy of Li and K are 5.4 and 4.3 eV respectively, approximate ionisation energy of Na will be: (1) 8.7 eV (2) 1.1 eV (3) 4.9 eV (4) 2.2 eV

Related theory

Ionisation enthalpy
Classification of Elements and Periodicity in Properties
Ionisation potential
Periodic Trends in Physical Properties

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