Explain how the symbols of the elements were devised?

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?

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.