The Electron Configuration: Ions Video Lessons

Concept: Electron Configurations (Cations)

# Problem: In one area of Australia, the cattle did not thrive despite the presence of suitable forage. An investigation showed the cause to be the absence of sufficient cobalt in the soil. Cobalt forms cations in two oxidation states, Co2+ and Co3+. Write the electron structure of the two cations.

###### FREE Expert Solution

Recall:

s orbital  can hold a maximum of 2 electrons
p orbitals → can hold a maximum of 6 electrons
d orbitals → can hold a maximum of 10 electrons
f orbitals → can hold a maximum of 14 electrons

Atomic number of Co = 27   27 electrons (neutral element)

• Electron configuration of Neutral Co: 1s22s22p63s23p64s23d7
• Noble gas electron configuration: [Ar]4s23d7
• nearest noble gas before Co = Argon (Ar)
• Charge = +2   subtract 2 electrons (lost e-) from (outermost shell) highest energy, n
• Charge = +3   subtract 3 electrons (lost e-) from (outermost shell) highest energy, n
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###### Problem Details

In one area of Australia, the cattle did not thrive despite the presence of suitable forage. An investigation showed the cause to be the absence of sufficient cobalt in the soil. Cobalt forms cations in two oxidation states, Co2+ and Co3+. Write the electron structure of the two cations.