Lithium and Its Electron Configuration

The video tutorial explains how to determine the number of valence electrons for lithium. It presents two methods: using the periodic table and writing the electron configuration. Lithium, being in group one of the periodic table, has one valence electron. The electron configuration method confirms this by showing that lithium's highest energy level has one electron. The video concludes by summarizing these findings.

What is the main focus of this video?

• Determining the number of neutrons in lithium

• Determining the number of protons in lithium

• Determining the number of valence electrons in lithium

• Determining the atomic mass of lithium

Which group in the periodic table does lithium belong to?

• Group 2

• Group 18

• Group 13

• Group 1

How many valence electrons do elements in Group 1 have?

• Four

• Three

• One

• Two

What is the exception in Group 18 regarding valence electrons?

• Helium has one valence electron

• Helium has eight valence electrons

• Helium has two valence electrons

• Helium has no valence electrons

What is the atomic number of lithium?

• 4

• 3

• 5

• 2

How many total electrons does a neutral lithium atom have?

• Four

• Two

• One

• Three

What is the electron configuration of lithium?

• 1s2 2s1

• 1s1

• 1s2 2p1

• 1s2 2s2

In which energy level are lithium's valence electrons found?

• Third energy level

• Fourth energy level

• Second energy level

• First energy level

How many valence electrons does lithium have?

• Two

• Three

• One

• Four