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2. Structure of Atom

The chapter delves into the fundamental structure of an atom, detailing the composition of subatomic particles such as protons, neutrons, and electrons. It explains key concepts like atomic number, mass number, and electron configuration, while also elucidating on the valency of elements and the significance of isotopes and isobars. Finally, the principles discussed serve as a foundation for comprehending chemical bonding and the periodic table's structure.

Sections

Structure of Atom

This section outlines the fundamental components of an atom, including its subatomic particles and atomic properties.

2 Section Overview

Start current section content and materials

2.1 Introduction to the Atom

Atoms are the fundamental units of matter, comprising elements and retaining their chemical properties.

2.2 Subatomic Particles

Atoms consist of three primary subatomic particles: protons, neutrons, and electrons, each with distinct charges and locations.

2.3 Atomic Number and Mass Number

This section explains the concepts of atomic number and mass number as fundamental characteristics of atoms.

2.4 Bohr’s Model of the Atom

Bohr's model describes electrons orbiting the nucleus in fixed paths, with each shell representing a specific energy level.

2.5 Electron Configuration

Electron configuration describes how electrons are arranged in the various shells of an atom.

2.6 Valency

Valency refers to the combining capacity of elements, dictated by the number of electrons in their outermost shell.

2.7 Isotopes and Isobars

Isotopes are variants of the same element with different mass numbers, while isobars are atoms of different elements that share the same mass number.

2.8 Importance of Atomic Structure

Atomic structure is crucial for understanding chemical bonding and reactivity, which are foundational in the study of elements.

Learning Objectives

  • An atom is the smallest particle of an element that retains its chemical properties.

  • Atoms comprise protons, neutrons, and electrons, each with distinct charges and locations.

  • Valency is determined by the number of valence electrons in an atom's outermost shell.

Key Concepts

Atom

The smallest particle of an element that retains its chemical properties.

Subatomic Particles

Particles that compose an atom, including protons, neutrons, and electrons.

Atomic Number

The number of protons in an atom, which defines the element.

Mass Number

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

Electron Configuration

The arrangement of electrons in an atom's shells.

Valency

The combining capacity of an element, determined by the number of electrons in its outermost shell.

Isotopes

Atoms of the same element that have the same atomic number but different mass numbers.

Isobars

Atoms of different elements that have the same mass number but different atomic numbers.

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