patterns hold for the (n-2)f energy levels of inner transition metals.

The d electron count is an alternative tool for understanding the chemistry of a transition metal.

The number of valence electrons

The number of valence electrons of an element can be determined by the periodic table group (vertical column) in which the element is categorized. In groups 1-12, the group number matches the number of valence electrons; in groups 13-18,

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