Helium Properties and Electron Configuration

The video tutorial explains how to determine the number of valence electrons for helium. It covers two methods: using the periodic table and examining the electron configuration. Helium is unique as it has two valence electrons, unlike other noble gases. The video details how helium's electron configuration, 1s2, accounts for its two valence electrons, making it a noble gas. The tutorial concludes by emphasizing helium's full energy level and its implications.

What is the primary focus of this video tutorial?

• Determining the number of protons in helium

• Learning about helium's isotopes

• Exploring the atomic mass of helium

• Understanding the number of valence electrons in helium

How many valence electrons does helium have?

• Eight

• One

• Two

• Four

Which group in the periodic table is helium an exception to?

• Group 1

• Group 2

• Group 14

• Group 18

What is the atomic number of helium?

• 3

• 4

• 2

• 1

Why can't helium have eight valence electrons?

• It is a liquid at room temperature

• It is a metal

• It only has two electrons

• It only has two protons

In which orbital are helium's electrons found?

• 2s

• 2p

• 1s

• 3s

What makes helium a noble gas?

• It has more than two electrons

• It is highly reactive

• It has a high atomic mass

• It has a full outer shell

What would happen if helium had more electrons?

• Helium would lose its noble gas status

• They would be added to a new shell

• They would be added to the same shell

• Helium would become a metal

What is the electron configuration notation for helium?

• 2p2

• 2s2

• 1s2

• 1s1

Why is helium considered a special case in the periodic table?

• It has more protons than electrons

• It is a liquid at room temperature

• It has a unique electron configuration

• It is the lightest element