When an electron jumps from 1st main energy level to 3rd main energy level, is energy released or absorbed?

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Which of the following is a compound? a.carbon b.oxygen c.hydrogen d.water

Ahypothrticalax type of ceramic material is known to have a density of 2.10 g/cm3 and a unit cell of cubic symmetry with a cell edge length of 0.57 nm. the atomic weights of the a and x elements are 28.5and 30.0 g/mol, respectively. on the basis of this information, which of the following crystal structures is (are) possible for this material: sodium chloride, cesium chloride, or zinc blende