Lewis Symbols Decoded: Simplifying Electron Counts

The video tutorial introduces Levis symbols, which represent valence electrons in atoms using dots around element symbols. It explains the Levis symbol for oxygen, highlighting its electronic configuration and valence electrons. The tutorial also discusses the significance of Levis symbols in determining an element's valency, using examples like carbon and nitrogen to illustrate how valency is calculated by subtracting the number of dots from eight.

What do Levis symbols represent in an atom?

• Atomic mass

• Valence electrons

• Neutrons

• Protons

How many valence electrons does oxygen have according to its Levis symbol?

• Two

• Eight

• Six

• Four

What is the electronic configuration of oxygen?

• 1s2 2s2 2p3

• 1s2 2s2 2p2

• 1s2 2s2 2p6

• 1s2 2s2 2p4

How is the valency of an element determined using Levis symbols?

• 8 minus the number of valence electrons

• Number of neutrons minus protons

• Number of protons minus electrons

• 8 minus the atomic number

What is the valency of carbon as indicated by its Levis symbol?

• Two

• Three

• Five

• Four