Periodic Table and Electron Configuration

The video tutorial explains the concept of valence electrons and electron configurations in chemistry. It covers the trend of valence electrons across the periodic table, highlighting exceptions like helium. The tutorial provides detailed examples of electron configurations for elements such as sodium, potassium, oxygen, neon, phosphorus, and iodine, illustrating how to determine the number of valence electrons and the highest energy levels. The video emphasizes the relationship between the periodic table and electron configurations, offering a powerful tool for understanding chemical properties.

What is the general trend for valence electrons in group one of the periodic table?

• They have one valence electron.

• They have two valence electrons.

• They have no valence electrons.

• They have three valence electrons.

How many valence electrons does sodium have?

• Three

• Four

• Two

• One

What is the highest energy level in the electron configuration of sodium?

• 1s

• 2p

• 2s

• 3s

What is the electron configuration ending for potassium?

• 3s1

• 4s1

• 4p1

• 3p1

How many valence electrons do elements in group two typically have?

• Four

• Three

• Two

• One

Why does oxygen have six valence electrons?

• It is in group 18.

• It ends in 3p4 and has a total of six electrons in the third energy level.

• It ends in 2p4 and has a total of six electrons in the second energy level.

• It is in the third energy level.

What is the total number of electrons in neon's highest energy level?

• Ten

• Two

• Eight

• Six

Which group does neon belong to on the periodic table?

• Group 13

• Group 1

• Group 2

• Group 18

How many valence electrons does phosphorus have?

• Seven

• Five

• Three

• Eight

What is the electron configuration ending for iodine?

• 4s1

• 5s1

• 4p5

• 5p5