Electron Configuration and Orbital Filling

The video tutorial explains how to write the electron configuration for cobalt using the periodic table. It starts by identifying cobalt's atomic number and the number of electrons. The tutorial then guides through the process of filling orbitals step-by-step, using both the periodic table and a chart. It also covers writing the condensed electron configuration using the noble gas argon. The video concludes by discussing the order of energy levels and the flexibility in writing configurations.

What is the atomic number of cobalt?

• 28

• 27

• 26

• 25

How many electrons does a neutral cobalt atom have?

• 27

• 26

• 28

• 25

Which block of the periodic table is used to start writing the electron configuration for cobalt?

• p-block

• d-block

• s-block

• f-block

How many electrons can the 2p orbital hold?

• 6

• 2

• 8

• 4

What is the electron configuration of cobalt in terms of orbitals?

• 1s2 2s2 2p6 3s2 3p6 3d8

• 1s2 2s2 2p6 3s2 3p6 3d7 4s2

• 1s2 2s2 2p6 3s2 3p6 4s2 3d7

• 1s2 2s2 2p6 3s2 3p6 4s1 3d7

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

• Argon

• Krypton

• Neon

• Xenon

What is the condensed electron configuration notation for cobalt?

• [Kr] 4s2 3d7

• [Ar] 4s2 3d7

• [Xe] 4s2 3d7

• [Ne] 3s2 3p6 4s2 3d7

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

• 3d has lower energy

• Their energies are very similar

• 4s has lower energy

• 3d is always filled first

In which order are the 4s and 3d orbitals typically filled?

• Simultaneously

• 3d before 4s

• 4s before 3d

• Depends on the element

What is the significance of the order in which orbitals are filled?

• It determines the atomic number

• It affects the chemical properties

• It has no significance

• It changes the element