Two characteristics of sodium :
1)It's a soft metal, reactive and with a low melting point.
2) when first cut the surface is bright and shiny, but quickly becomes dull as sodium reacts with oxygen in the air.
Two characteristics of cesium:
1)Cesium is ductile alkali metal, silvery-gold, soft, .
2)Cesium reacts explosively when contact with water producing cesium hydroxide (CsOH),
