Examples include carbonated water (i.e. soda water); honey; sugar syrup (used in confectionery); supersaturated drug delivery systems. "SDDS"; and sodium acetate solutions prepared from 160 g NaOAc and 30 mL water.
Chromium , silver, zinc...
Because group 1a and 2a are most reactive due to their least number of electrons in their outmost shell compared to group 8a(18)