What group of elements generally have the lowest second ionization energy?

Which metal exist in liquid state and can be cut with knife ?

Which ocean zone has the most abundant primary producer and why a) the abyssopelagic zone ,du to the absence of light and cold water temperatureb) the bathypelagic zone, due to the absence of light and cold water temperaturec) the mesopelagic zone ,due to uts high light availability and warm water temperature d) the epipelagic zone,due to its high light availability and warm water temperature

What are four significant sources of ghgs that come from wostem washington?