Is SiO2 + 4 HF → SiF4 + 2 H2O balanced?

How many neutrons does a atom of cobalt have?

Draw metallic bonding if two copper

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