Chunk-based strategy and mnemonics have been developed to write ground state electron configurations of elements, which is a routine exercise for the higher secondary (pre-university) level general chemistry students. To assimilate a better understanding of the nature of chemical reactions, an adequate knowledge of the periodic table of elements is mandatory. Valence shell electrons of elements participate in redox chemical reactions. Chemistry students thus must be able to write electron configurations correctly. Here we have explored a chunking tool for determining the electron configurations of elements having atomic numbers up to 120.