Question

X is most inert element and Y is the most reactive element in the long form of periodic table. X and Y are respectively.
1) H and F 2) He and F
3) He and Cs 4 )Xe and F

Answer 1

Answer:

2) He and F

Explanation:

He is a noble gas i.e inert to reactions under normal conditions.

F is a halogen so highly reactive.

Answer 2

Answer:

Explanation:

An atom of the chemical element helium is known as a helium atom. One or two neutrons, depending on the isotope, and two protons, locked together by the strong force, make up the nucleus of helium, which is made up of two electrons bonded by the electromagnetic force to it. In contrast to hydrogen, the helium atom does not have a closed-form solution to the Schrödinger equation. The energy and wavefunction of the atom's ground state can, however, be estimated using a variety of approximations, including the Hartree-Fock approach.

The chemical element fluorine has an atomic number of $9$ and the symbol F. The lightest halogen, it is an extremely poisonous, pale yellow diatomic gas under normal conditions. It is exceedingly reactive and, as the most electronegative element, reacts with all other elements with the exception of argon, neon, and helium.

Because $He$ is a noble gas, he is inert to reactions under typical circumstances.

$F$ is an extremely reactive halogen.

Hence the answer is $He and F$.

#SPJ2