All of the alkali earth metals, group 2, have two valence electrons. which of these would represent the oxidation number of the alkali earth metals such as magnesium and calcium?

Idon't really understand this can you me and show your work.☺☺[ chemistry b] subject [ electron transfer in lonic bonds]grade( 12)

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 is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?