Co3+ electron configuration: (one of the transition elements of 3d group)
Co: 1s2, 2s22p6, 3s23p83d7, 4s2 --> minus 3 el's --> Co3+: 1s2, 2s22p6, 3s23p63d4, 4s26
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The electron configuration of neutral boron is 1s^2 2s^2 2p^1. When boron forms a +1 ion, it loses 1 electron to become 1s^2 2s^2.
Neutral antimony, Sb, has 51 electrons, so Sb-3 would have three more electrons than that, or 54.
The ion formed when sodium achieves a stable electron configuration is Na+ (sodium ion). Sodium (Na) loses one electron to achieve a stable electron configuration similar to that of neon.
1s2 2s2 2p6 is the electron configuration of the fluoride ion. It has a complete octet and is isoelectronic with neon. Before it becomes an ion, it is 1s2 2s2 2p5 Then it gains an electron and has a negative charge.
The symbol for a chlorine ion that has gained one electron to achieve a stable electron configuration would be Cl-.
Argon has the same electron configuration as a potassium ion, as both species have 18 electrons with the electron configuration of [Ne]3s²3p⁶.
Boron typically loses 3 electrons to achieve a stable electron configuration. This results in a 3+ charge on the boron ion.