smartwork At least one atom does not contain a properly depicted valence. What should be added or removed to correct this error

How are isotopes of the same chemical element alike? how are they different?

What does the mass of 0.7891 mol of ferric oxide (fe2o3)

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.