Electron configuration, continued transition elements

Strategy (a) Use the building-up principle discussed in Section 2.2 to write the electron configuration with principal quantum number n = 1 and continue upward until all the electrons are accounted for. (b) To determine whether the atom should be classified as a representative element, a transition metal, or a noble gas, consider its electron configuration characteristics, (c) Examine the pairing scheme of the electrons in the outermost shell. The element will be diamagnetic if all electrons are paired and paramagnetic if some are unpaired. 

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