Electron Configuration of Iron

The video tutorial explains how to write the electron configuration for iron (Fe) by first identifying its atomic number and using the periodic table. It details the step-by-step process of filling electron orbitals, starting from 1s to 3d, and concludes with the condensed electron configuration using argon as the noble gas reference. The tutorial also discusses the order of filling orbitals and the similarities in energy levels between 4s and 3d.

What is the atomic number of iron, and what does it signify?

• 56, indicating the number of protons

• 26, indicating the number of protons

• 56, indicating the number of neutrons

• 26, indicating the number of neutrons

How many electrons does a neutral iron atom have?

• 30

• 28

• 24

• 26

Which method is preferred for writing the electron configuration of iron?

• Using a computer program

• Using a calculator

• Using the periodic table

• Using a chart

What is the maximum number of electrons that the 2p orbital can hold?

• 2

• 4

• 8

• 6

In the electron configuration of iron, which orbital is filled after 3p?

• 4s

• 5s

• 3d

• 2p

How many electrons are placed in the 3d orbital for iron?

• 6

• 7

• 5

• 4

What is the electron configuration of iron in terms of 4s and 3d orbitals?

• 4s2 3d5

• 4s2 3d6

• 4s1 3d5

• 4s2 3d4

Which noble gas is used in the condensed electron configuration of iron?

• Neon

• Xenon

• Krypton

• Argon

In the condensed notation, which orbital is written first after the noble gas?

• 5s

• 2p

• 4s

• 3d

Why might the 3d orbital be written before the 4s in some cases?

• Because 3d is closer to the nucleus

• Due to similar energy levels

• Because 4s is not filled

• Because 3d has lower energy