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A researcher is using a particle accelerator in an experiment studying isotopes. How can the researcher change one isotope into a different isotope of the same element?

Sonya reads the element riddle below.

I am shiny. I form +1 ions. There’s more!
I am the most reactive metal in Period 4. 
Who am I?

Which element is the answer to the riddle?

hich describes a value for density?

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