How does the economy influence energy source choices?

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

What amount of heat is exchanged when 106.2 grams of substance y goes from a liquid at 35 degrees celsius to a solid at the same temperature? melting point of substance y = 35 degrees c; δhvaporization = 3.67 j/mol; δhfusion = 3.30 j/mol. mwsubstance y = 28.22 g/mol. −12.4 j −3.51 x 102 j 1.24 x 101 j 351 j

Which sample at stp has the same number of atoms as 18 liters of ne at stp