A sodium atom (Z 5 11) contains 11 protons in its nucleus.
Chapter , Problem 16(choose chapter or problem)
A sodium atom (Z 5 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 outermost electron as an approximation, provided that we use an eff ective value Zeff ective 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 5 Zeff ective to calculate a value for Zeff ective. (b) Using Z 5 11 and Z 5 Zeff ective, determine the corresponding two values for the radius of the outermost Bohr orbit.
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