Question

Find the energy of the ground state of helium atom assuming the effective nuclear charge of 1s electron as 1.6875

Answer 1

By contrast, the Bohr theory failed miserably in attemps to apply it beyond the hydrogen atom. The energy of the three separated particles on the right side of Eq (1) is, by definition, zero. Therefore the ground-state energy of helium atom is given by E0 = −(I1 + I2) = −79.02 eV = −2.90372 hartrness.

The helium ground state consists of two identical 1s electrons. The energy required to remove one of them is the highest ionization energy of any atom in the periodic table: 24.6 electron volts.