Which of these statements best describes the formula unit for a compound made from mg and ci

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)

We are hoping to create 5.72 grams of glucose. the plant was given 4.75 liters of co2 and 2.81 g of h20. which reactant was the limiting reagent? how much excess mass did we have of the other reactant?

What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm?