Question

francium has 36 isotopes, but only francium-223 occurs in nature. Francium-223 spontaneously emits particles and energy, so francium-223 is a (an) of francium.

Answer 1

Question: Francium has 36 isotopes, but only francium-223 occurs in nature. Francium-223 spontaneously emits particles and energy, so francium-223 is a (an) of francium.                                                                                                 Answer: Francium-233 is a radioisotope   

Answer 2

Answer;

Radioisotope

Francium-223 is a radioisotope of francium

Explanation;

• Radioisotopes are radioactive isotopes since they contain unstable nucleus and thus emit energy and particles when it changes to a more stable form.
• Radioactive isotopes have an unstable nucleus that decays or emits excess energy or radiation until the nucleus becomes stable. They can be naturally occurring or artificial isotopes of an element.
• Francium-223 is an example of radioactive isotope of Francium element.