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4. Atomic Structure and Chemical Bonding

Atoms serve as the fundamental units of matter participating in chemical reactions. The chapter elucidates the internal structure of atoms, including the role of protons, neutrons, and electrons, as well as the formation of chemical bonds. It details atomic number, mass number, electron distribution in shells, and the practicality of valence electrons and valency in chemical bonding.

Sections

Atomic Structure and Chemical Bonding

This section covers the fundamental concepts of atomic structure and the types of chemical bonding relevant to compounds.

4 Section Overview

Start current section content and materials

4.1 Introduction

This section introduces atoms as the fundamental units of matter and outlines how they combine to form compounds via chemical bonding.

4.2 Structure of an Atom

An atom is composed of protons, neutrons, and electrons, each with distinct properties and locations.

4.3 Atomic Number and Mass Number

This section defines atomic number and mass number, explaining their significance in atomic structure.

4.4 Distribution of Electrons in Shells (Bohr's Model)

Bohr's model describes the arrangement of electrons in shells around the nucleus with specific capacities.

4.5 Valence Electrons and Valency

This section discusses valence electrons, which are the electrons in the outermost shell of an atom, and valency, defined as the combining capacity of an atom based on electrons gained, lost, or shared.

4.6 Octet Rule

The Octet Rule states that atoms tend to gain, lose, or share electrons to achieve a stable configuration with eight electrons in their outermost shell.

4.7 Types of Chemical Bonding

This section outlines the two main types of chemical bonding: ionic and covalent bonds, highlighting their formation and characteristics.

4.7.1 Electrovalent (Ionic) Bond

Electrovalent bonds form through the transfer of electrons, typically between metals and non-metals, resulting in positively and negatively charged ions.

4.7.2 Covalent Bond

Covalent bonds are formed through the sharing of electrons between non-metal atoms, allowing them to achieve stable electron configurations.

4.8 Properties of Ionic and Covalent Compounds

This section outlines the distinct properties of ionic and covalent compounds, focusing on their physical states, melting/boiling points, solubility, and conductivity.

Learning Objectives

  • Atoms consist of electrons, protons, and neutrons.

  • The atomic number is the number of protons and determines the element, while the mass number is the total count of protons and neutrons.

  • Electrons are distributed in energy levels or shells around the nucleus, governed by rules such as the octet rule.

Key Concepts

Electron

A negatively charged particle that orbits around the nucleus of an atom.

Valency

The combining capacity of an atom, determined by the number of electrons gained, lost, or shared.

Ionic Bond

A bond formed through the transfer of electrons from one atom to another, resulting in electrostatic attraction between oppositely charged ions.

Covalent Bond

A bond formed by the sharing of electrons between two non-metal atoms.

Mass Number

The total number of protons and neutrons in the nucleus of an atom.

Practice Exercises

Total Questions

3

Estimated Time

6 min

Passing Score

70%

Instructions

  • Read each question carefully
  • You can use hints if you need help
  • Complete all questions before submitting