A sodium atom (Z=11_ contains 11 protons in its nucleus. Strictly speaking, the

Question

A sodium atom (Z=11_ contains 11 protons in its nucleus. Strictly speaking, the Bohr model does not apply, because the neutral atom contains 11 electrons instead of a single electron. However, we can apply the model to the poutermost electron as an apprxiomation, provided that we use an effect value Zeffective rather than 11 for the number of protons in the nucleus. a) The ionization energy for the outermost electron in a sodium atom is 5.1 eV. Use the Bohr model with Z = Zeff to calculate a value for Zeffective. b) Using Z=11 and Z=Zeff determine the corresponding two values for the radius of the outermost Bohr orbit.

Explanation / Answer

A sodium atom (Z=11_ contains 11 protons in its nucleus. Strictly speaking, the

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