What is the charge of the oxygen ion when it has a filled outermost energy level? A. 2+

B. 2-

C. 1-

D. 1+

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

Draw the aromatic compound toluene (methylbenzene). show all hydrogen atoms, including those on the ring.

What is the enthalpy of combustion (per mole) of c4h10 (g)? –2,657.5 kj/mol –5315.0 kj/mol –509.7 kj/mol –254.8 kj/mol