Valence Electrons in Chemistry

The video explains helium's unique position in the periodic table, being in group 18 but having only two valence electrons. It discusses the importance of valence electrons in forming chemical bonds and how the periodic table helps determine the number of valence electrons for each element. The video also covers the typical number of valence electrons for elements in various groups, highlighting helium's exception. Finally, it concludes with a brief mention of the Lewis dot structure for helium.

Which group does helium belong to on the periodic table?

• Group 1

• Group 8A or 18

• Group 3A or 13

• Group 2

What is the primary role of valence electrons in chemistry?

• They are responsible for the element's radioactivity.

• They define the element's color.

• They are involved in forming chemical bonds.

• They determine the atomic mass.

How many valence electrons does hydrogen have?

• Two

• Four

• Three

• One

Which group of elements is skipped when discussing valence electrons due to complexity?

• Transition metals

• Alkali metals

• Noble gases

• Halogens

How many valence electrons do elements in group 14 typically have?

• Two

• Eight

• Six

• Four

What is the expected number of valence electrons for elements in group 18?

• Six

• Four

• Two

• Eight

Why is helium an exception in its group regarding valence electrons?

• It has no valence electrons.

• It has two valence electrons instead of eight.

• It has more than eight valence electrons.

• It shares valence electrons with other elements.