The Electron Configuration: Ions Video Lessons

Concept: Electron Configurations (Cations)

# Problem: Name the element described in the following: Forms 2+ ion with electron configuration [Ar] 3d3.

###### FREE Expert Solution

Neutral element:       Atomic number = # protons = # of electrons

• Cation with charge = 2+: lost 2 electrons
• Recall:

s orbital  can hold a maximum of 2 electrons

p orbitals → can hold a maximum of 6 electrons

d orbitals → can hold maximum of 10 electrons

f orbitals → can hold maximum of 14 electrons

Electron configuration: [Ar]3d3

• [Ar]: atomic # = 18 18 e
• [Ar] = 1s22s22p63s23p6
• 3d3 3 ein d orbital

Total electrons in cation = 18 + 3 = 21

Total electrons of neutral element = 21 + (2) = 23

• electron configuration of neutral element: 1s22s22p63s23p64s23d3
• transition metals lose e- from highest energy orbital (4s)
• s orbital first before the d orbital
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###### Problem Details

Name the element described in the following: Forms 2+ ion with electron configuration [Ar] 3d3.