Condensed Electron Configurations and Valence Electrons

This video tutorial teaches how to write condensed electron configurations using examples of elements like bromine, lithium, carbon, calcium, iodine, and barium. It explains the concept of noble gas cores and how to simplify electron configurations by using noble gases. The video also covers the impact of ions on electron configurations and the role of d orbitals in chemical reactions. By the end, viewers will understand how to efficiently write condensed electron configurations and recognize valence electrons.

What is the first step in writing a condensed electron configuration?

• Identify the element's atomic number

• Find the noble gas preceding the element

• Determine the element's group in the periodic table

• Count the number of valence electrons

For lithium, which noble gas is used in its condensed electron configuration?

• Argon

• Helium

• Neon

• Krypton

How many electrons does carbon have in its full electron configuration?

• 8

• 10

• 6

• 4

What is the condensed electron configuration for calcium?

• [Ne] 3s2 3p6

• [He] 2s2 2p6

• [Ar] 4s2

• [Kr] 5s2

What happens to the electron configuration of Ca2+ compared to neutral calcium?

• It loses two electrons

• It gains two electrons

• It gains one electron

• It remains the same

Which noble gas is used in the condensed electron configuration for iodine?

• Neon

• Argon

• Krypton

• Xenon

Why do d orbitals not usually participate in chemical reactions?

• They are always empty

• They are unstable

• They are always full

• They are too far from the nucleus

What is the condensed electron configuration for barium?

• [Xe] 6s2

• [Kr] 5s2 4d10

• [Ar] 4s2 3d10

• [Ne] 3s2 3p6

How many valence electrons does barium have?

• 4

• 3

• 2

• 1

What is the main advantage of using condensed electron configurations?

• They use fewer elements

• They clearly show valence electrons

• They are easier to memorize

• They are more accurate