How many different sublevels are in the first energy level.

When a septic tank backs up a goes in to clean it out

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.

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