Copper Valence Electrons
Why copper has 11
Copper has 29 electrons, arranged as 1s2 2s2 2p6 3s2 3p6 3d10 4s1. Counting the 4s electrons plus the 3d electrons gives 11, the usual textbook convention for transition metals. Some courses count only the electrons in the outermost shell, which gives 1 for copper; check which convention your class uses.
Copper is a transition metal in group 11. Counting its outer s electrons plus the d electrons beneath them gives 11, the same as the group number.
What that means for bonding
Transition metals can lose different numbers of these electrons, which is why copper shows several oxidation states (+1, +2, +3, +4). When it forms a cation it loses the 4s electrons first.
Electrons per shell: 2, 8, 18, 1. See the copper electron configuration and orbital diagram or the full copper data sheet.
Same group, same count
Copper valence electrons FAQ
How many valence electrons does copper have?
Copper has 11 valence electrons. Its electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s¹; the count is 1 outer s + 10 d electrons; 1 in the outermost shell. If your course counts only outermost-shell electrons, the answer is 1.
How do you find the valence electrons of copper?
Copper is a transition metal in group 11. Counting its outer s electrons plus the d electrons beneath them gives 11, the same as the group number.
How many bonds does copper form?
Transition metals can lose different numbers of these electrons, which is why copper shows several oxidation states (+1, +2, +3, +4). When it forms a cation it loses the 4s electrons first.