The increasing order of reactivity among group 1 elements is Li < Na < K < Rb CI > Br > I. Explain.
Answers
The elements belongs to s block with general electronic configuration ns1 .group 1 elementa are called as alkali metals & are radioactive in nature.
The elements present in group 1 have only 1 valence electron, which they tend to lose.
Group 17 elements, on the other hand, need only one electron to attain the noble gas configuration.
On moving down group 1, the ionization enthalpies decrease due to their very large atomic size, as a result of which the valence s electron can be readily removed .
These values decrease down the group because of the decrease in the magnitude of force of attraction with the nucleus on account of increased atomic radii & magnitude of screening effect
Thus, the increasing order of reactivity among group 1 elements is as given below:
Li < Na < K < Rb < Cs
The halogens(sea salt producers) In group 17, as we move down the group from Cl to I, the fluorine is the most reactive & iodine is least reactive because these halogens have low dissociation energies, as a result they easily dissociate into atoms & react with other substances.
Also the halogens have high electron affinity & can easily gain an electron.
Thus, the decreasing order of reactivity among group 17 elements is as given below:
F > Cl > Br > I