Because having a half-filled s sublevel, such as 4s1, followed by a filled d sublevel, such as 3d10 is more stable than having a filled s sublevel, such as 4s2, followed by a d sublevel that is almost full, such as 3d9, which is very unstable.
The complete electron configuration for the copper atom is 1s2 2s2 2p6 3s2 3p6 4s1 3d10.
The electron configuration of copper is: [Ar]4s13d10. It isn't 4s23d9 because Cu is able to obtain a more stable electron configuration when it takes an electron from the 4s and adds it to 3d. A half filled 4s and a completely filled 3d is more stable.
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p5
The electronic configuration of bromine (atomic number 35) is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5. This means that it has 35 electrons arranged in energy levels and sublevels according to the Aufbau principle.
The abbrieviated electron configuration of copper is [Ar] 4s23d9
The complete electron configuration for the copper atom is 1s2 2s2 2p6 3s2 3p6 4s1 3d10.
The electron configuration of copper is: [Ar]4s13d10. It isn't 4s23d9 because Cu is able to obtain a more stable electron configuration when it takes an electron from the 4s and adds it to 3d. A half filled 4s and a completely filled 3d is more stable.
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p5
The electron configuration of copper is [Ar] 3d^10 4s^1. This means that copper has 29 electrons, filling up the 3d subshell completely with 10 electrons before moving on to the 4s subshell, where one electron is present.
The electronic configuration of bromine (atomic number 35) is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5. This means that it has 35 electrons arranged in energy levels and sublevels according to the Aufbau principle.
The electron configuration of bromine is [Ar] 3d10 4s2 4p5, which means bromine has 35 electrons distributed among its orbital shells.
The abbrieviated electron configuration of copper is [Ar] 4s23d9
The electron configuration of neutral arsenic (As) is [Ar] 4s2 3d10 4p3. Since As3- has gained three extra electrons, the electron configuration becomes [Ar] 4s2 3d10 4p6, as the additional electrons fill the 4p subshell.
1s2, 2s2, 2p6, 3s2, 3p6, 4s1, 3d10 or [Ar]3d10, 4s1
1s2, 2s2, 2p6, 3s2, 3p6, 3d10, 4s2, 4p6, 4d4, 5s1, or [Kr] 4d4, 5s1.
1s2 2s2 2p6 3s2 3d10 4s2 4p3
Group 2 (Alkaline Earth Metals) Beryllium: 1s2 2s2 Magnesium: 1s2 2s2 2p6 3s2 Calcium: 1s2 2s2 2p6 3s2 3p6 4s2 Strontium: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2 Barium: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2 4d10 5p6 6s2 Radium: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4f14 4d10 4p6 5s2 5d10 5p6 6s2 6s2 6p6 7s2