Cambridge International AS and A Level Chemistry Original material © Cambridge University Press 2011 1 Worksheet 3.6 Electronic configuration of ions 1 Write the electronic configuration of each of the following ions using 1s 2 notation. a Cl b K + c Zn 2+ d H e Al 3+ f Cu 2+ g Cr 3+ h Se 2 i N 3 j Fe 2+ [1] for each, total [10] 2 Write each of the ions in question 1 in the form that shows the noble gas core. For example: Mg 2+ : 1s 2 2s 2 2p 6 can be written [Ne] and Ni 2+ : 1s 2 2s 2 2p 6 3s 2 3p 6 3d 8 can be written [Ar] 3d 8 [10] 3 Atoms and ions that have the same electronic structure are said to be isoelectronic. a Which of the ions in question 1 are isoelectronic with argon? [1] b Write the formulae of two positive ions and two negative ions that are isoelectronic with the Mg 2+ ion. [4] c Which atom is isoelectronic with an I ion? [1]
