Electron Configuration and Valence Electrons

The video tutorial explains electron configurations, focusing on valence and core electrons. It uses germanium, lead, and titanium as examples to illustrate how to determine the number of valence and core electrons based on their electron configurations. The tutorial highlights the importance of the highest energy level and the role of partially and fully filled subshells in classifying electrons.

What are valence electrons in an electron configuration?

• Electrons in the 1s subshell

• Electrons in completely filled d and f subshells

• Electrons in the outermost shell and partially filled d or f subshells

• Electrons in the innermost shell

For germanium, which subshells contain the valence electrons?

• 1s and 2s

• 3p and 4p

• 4s and 4p

• 3d and 4s

How many core electrons does germanium have?

• 24

• 22

• 20

• 18

What is the highest energy level for lead in its electron configuration?

• n=4

• n=5

• n=6

• n=7

How many valence electrons does lead have?

• 6

• 8

• 4

• 2

Which subshells in titanium's electron configuration contain valence electrons?

• 5s and 4d

• 4p and 3d

• 3s and 3p

• 4s and 3d

How many core electrons does titanium have?

• 20

• 18

• 22

• 16