How much energy is necessary to remove an electron from the second Bohr orbit so that it is beyond the influence of the nucleus
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The negative sign shows that the electron is attracted towards the nucleus by electrostatic force and to remove the electron energy must be supplied. The energy needed to remove the electron in the first orbit is +13.6 eV and this is called ionising energy of hydrogen.
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hope u will get it........and answer will be +3.4ev as it ionisation energy is positive ..when we give energy then there will be positive sign
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