5.0 gram sample of calcium carbonate contaminated with the volatile impurities left Residue of 2.2 gram on strong heating what is the percentage of pure caco3 in the sample in { CA = 40 C=12 and O = 16}​

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.