Noble Gases and Valence Electrons

The video tutorial explains the number of valence electrons in noble gases, which are located in group 18 of the periodic table. It highlights the trend of valence electrons across different groups, noting that noble gases typically have eight valence electrons, except for helium, which has two. The video also discusses the periodic table's orbital blocks and why helium is an exception due to its electron configuration. The tutorial concludes with a summary of these key points.

Which group do noble gases belong to in the periodic table?

• Group 13

• Group 1

• Group 8

• Group 18

How many valence electrons do elements in Group 1 have?

• Four

• One

• Two

• Three

What is the number of valence electrons for elements in Group 13?

• Two

• One

• Three

• Four

Why is helium an exception among noble gases?

• It has eight valence electrons.

• It is not a gas.

• It is reactive.

• It has only two valence electrons.

What is the atomic number of helium?

• 10

• 2

• 1

• 18

Which orbital block does helium belong to?

• F block

• D block

• P block

• S block

How many electrons does neon have in total?

• 8

• 10

• 2

• 18

How many valence electrons does argon have?

• 8

• 10

• 6

• 2

What is the common number of valence electrons for noble gases, excluding helium?

• 8

• 6

• 4

• 2

Why are noble gases generally non-reactive?

• They have no electrons.

• They are all liquids.

• They have a full outer shell of electrons.

• They have low atomic numbers.