C6H14\mathrm{C}_{6} \mathrm{H}_{14}C6H14
C6H5CH3\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CH}_{3}C6H5CH3
Ca\mathrm{Ca}Ca
K2CO3\mathrm{K}_{2} \mathrm{CO}_{3}K2CO3