Valency and Electron Configuration Concepts

The video tutorial introduces the basics of chemical bonding, focusing on core and valence electrons. It explains the concept of valency, which is the combining capacity of an atom, and provides examples of calculating core and valence electrons for various elements. The tutorial also discusses the electron configuration of group elements and how valency is determined by the number of valence electrons. The video aims to provide a foundational understanding of these concepts to help students grasp the basics of chemical bonding.

What are core electrons?

• Electrons in the innermost shells

• Electrons with the highest energy

• Electrons in the outermost shell

• Electrons involved in bonding

How are valence electrons defined?

• Electrons in the innermost shells

• Electrons in the outermost shells

• Electrons that do not participate in bonding

• Electrons with the lowest energy

What is valency?

• The number of core electrons

• The energy level of an atom

• The number of valence electrons

• The combining capacity of an atom

How is valency calculated for elements with more than four valence electrons?

• By adding the number of core electrons

• By dividing the number of valence electrons by 2

• By multiplying the number of valence electrons by 2

• By subtracting the number of valence electrons from 8

What is the valency of nitrogen?

• 4

• 1

• 2

• 3

How many bonds can carbon form with other atoms?

• One

• Two

• Three

• Four

What is the valency of oxygen?

• 2

• 4

• 1

• 3

Which element has a valency of 1 in Group 1 elements?

• Lithium

• Beryllium

• Boron

• Carbon

What is the core electron configuration for sodium?

• Neon

• Radon

• Helium

• Argon

How many valence electrons does potassium have?

• 1

• 2

• 4

• 3