Energy of the σ1s MO if the h atoms in H₂ were pulled apart to a distance twice as long as its normal bond length then the energy would increase and radius would decreases
If coulomb force is positive and negative then in the hydrogen atom nucleus is positive charge and electron is localized in its 1st orbit and coulombs are said to f final = 2f and if the force increases the energy level increases and the electron and the positive charge are both in the opposite nature so the orbit would be shrinking toward the nucleus so that's why the radius would decreases
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