Copper and chromium have one valence electron they are exceptions , because they have one 4s electron. It is not obvious. Valence electrons are those that are important in chemical bonding. For transition metals, the word "important" will vary depending on the context.
It is easier and more practical to describe which orbitals are valence orbitals when it comes to transition metals although it gets difficult with lanthanides and actinides. In general, the first-row transition metals have a set of valence orbitals that include their 4s and 3d 's, but the number of valence electrons will vary. So in general, I would say the number of valence electrons for transition metals and lanthanide and actinides vary in an unpredictable way, but the valence orbitals could sometimes be predicted with enough chemical intuition.
A list of reference sources used to compile the data provided on our periodic table of elements can be found on the main periodic table page. Kenneth Barbalace. Periodic Table of Elements - Copper - Cu. Linking to this page If you would like to link to this page from your website, blog, etc.
We are a great educational resource! Use online or print pages out as classroom handouts. More info. Skip to page content Skip to site menu on this page Periodic Table of Elements Element Copper - Cu Comprehensive data on the chemical element Copper is provided on this page; including scores of properties, element names in many languages, most known nuclides of Copper.
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