Cobalt Valence Electrons and Configuration

This video tutorial explores the concept of valence electrons, focusing on cobalt (Co). It begins by discussing the periodic table's main group elements and their valence electron patterns. The video then delves into the electron configuration of cobalt, explaining how to determine its valence electrons using condensed notation and the noble gas core. Finally, it examines how cobalt forms ions by losing electrons, highlighting the common ions cobalt forms when bonding with other elements.

What is the pattern of valence electrons in main group elements on the periodic table?

• Group 1 has 3 valence electrons, Group 2 has 4

• Group 1 has 4 valence electrons, Group 2 has 5

• Group 1 has 1 valence electron, Group 2 has 2

• Group 1 has 2 valence electrons, Group 2 has 3

Where is cobalt located on the periodic table?

• In the d-block

• In the p-block

• In the s-block

• In the f-block

What is the atomic number of cobalt?

• 29

• 26

• 27

• 28

What is the noble gas core used for cobalt's electron configuration?

• Xenon

• Argon

• Krypton

• Neon

How many valence electrons does cobalt have outside the noble gas core?

• 5

• 7

• 11

• 9

What happens to cobalt's electron configuration when it forms a 2+ ion?

• It loses two electrons in the 3d orbital

• It loses two electrons in the 4s orbital

• It gains two electrons in the 4s orbital

• It gains two electrons in the 3d orbital

What is the electron configuration for cobalt when it forms a 3+ ion?

• 4s23d5

• 4s03d6

• 4s03d5

• 4s13d6

How many valence electrons can cobalt potentially lose when forming ions?

• 1 or 2

• 2 or 3

• 3 or 4

• 4 or 5

What is the significance of the noble gas core in determining valence electrons?

• It includes all valence electrons

• It only includes s-block electrons

• It excludes valence electrons

• It is irrelevant to valence electrons

What is the main takeaway about finding valence electrons for cobalt?

• Cobalt has no valence electrons

• Cobalt's valence electrons are in the f-block

• Cobalt's valence electrons are outside the noble gas core

• Cobalt's valence electrons are inside the noble gas core