Electron Configuration of Strontium

The video tutorial explains how to write the electron configuration for strontium, which has an atomic number of 38. It begins by identifying the number of protons and electrons in strontium and proceeds to detail the step-by-step process of writing its electron configuration using the periodic table. The tutorial also covers the condensed notation for strontium, using krypton as the noble gas reference. Finally, it discusses the order of filling orbitals, noting that 4s is filled before 3d, and concludes with a summary of the electron configuration for strontium.

What is the atomic number of strontium?

• 36

• 37

• 38

• 39

How many electrons does a neutral strontium atom have?

• 36

• 37

• 39

• 38

Which orbital block do you start with when writing the electron configuration for strontium?

• 4d

• 3p

• 1s

• 2s

How many electrons can the 'p' orbital hold?

• 6

• 2

• 8

• 4

What is the electron configuration for strontium after filling the 4s orbital?

• 1s2 2s2 2p6 3s2 3p6 4s2 5s2

• 1s2 2s2 2p6 3s2 3p6 4s2

• 1s2 2s2 2p6 3s2 3p6 4s2 3d10

• 1s2 2s2 2p6 3s2 3p6 4s2 4p6

Which noble gas is used for the condensed electron configuration of strontium?

• Xenon

• Argon

• Neon

• Krypton

What is the condensed electron configuration for strontium?

• [Xe] 6s2

• [Ne] 3s2 3p6

• [Kr] 5s2

• [Ar] 4s2 3d10 4p6 5s2

Why might the 3d orbital sometimes be written before the 4s orbital?

• Because it has lower energy

• Because it is filled first

• Because they have similar energies

• Because it is a convention

In which period is strontium located on the periodic table?

• 6th

• 3rd

• 4th

• 5th

What is the significance of the 5s2 notation in strontium's electron configuration?

• It indicates the number of valence electrons

• It shows the total number of electrons

• It represents the core electrons

• It is the last filled orbital