Which colour is imparted by francium to the flame?

Francium is a radioactive element- i'm not so sure if it is a good thing to do a flame test on it. read more

The francium color in the flame test is not known today - francium is an extremely rare element to make these experiments. read more

Then, electrons are recaptured. In the process of becoming part of an atom again, an electron emits a photon, with a typical wavelength for a given element, thereby creating a characteristic color. As a result of this process, the color of a flame is mainly due to whatever metals are present. read more