Valence Electrons and Stability Rules

The video tutorial explains valence electrons, focusing on their role in chemical stability. It covers examples using sodium and sulfur, discusses main group elements, and explains the octet rule with its exceptions. The tutorial also includes a practical analogy to help understand why atoms gain or lose electrons to achieve stability.

What is the number of valence electrons in sodium?

• 2

• 8

• 1

• 6

Which of the following elements has six valence electrons?

• Helium

• Sulfur

• Sodium

• Fluorine

Which group of elements is known as the main group elements?

• Groups 1 and 2

• Groups 3 to 12

• Groups 13 to 18

• Groups 1, 2, 13 to 18

What is the electronic configuration ending for elements in Group 13?

• s2 p1

• s1

• p5

• d10

What does the octet rule state about the stability of atoms?

• Atoms are stable with 8 or 0 valence electrons

• Atoms are stable with 5 valence electrons

• Atoms are stable with 6 valence electrons

• Atoms are stable with 10 valence electrons

How does fluorine achieve stability according to the octet rule?

• By losing two electrons

• By gaining two electrons

• By gaining one electron

• By losing one electron

Why is it easier for nitrogen to gain electrons rather than lose them?

• It requires less energy to lose 3 electrons

• It requires more energy to lose 5 electrons

• It requires more energy to gain 5 electrons

• It requires less energy to gain 3 electrons

What analogy is used to explain why elements gain or lose electrons?

• A mountain with peaks

• A tree with branches

• A building with floors

• A river with streams

Which elements are stable with only two electrons in their outer shell?

• Sodium, Potassium, and Calcium

• Helium, Lithium, and Hydrogen

• Oxygen, Nitrogen, and Carbon

• Fluorine, Chlorine, and Bromine

What is the term used for the stability rule applicable to elements like lithium and helium?

• Octet Rule

• Duet Rule

• Triplet Rule

• Quartet Rule