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Difference Between Atoms and Ions for JEE Main 2024

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Last updated date: 19th Jul 2024
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What is Atoms and Ions: Introduction

To differentiate between atoms and ions: Atoms are the basic building blocks of matter, representing the smallest unit of a chemical element that retains its unique properties. They consist of a central nucleus composed of protons and neutrons, with electrons orbiting the nucleus at specific energy levels. In contrast, ions are atoms or groups of atoms that have gained or lost electrons, resulting in a net positive or negative charge. Positively charged ions are called cations, while negatively charged ions are called anions. Ions play a crucial role in chemical reactions and electrical conductivity, while atoms form the foundation of all matter and their interactions govern the properties and dynamics of the physical world. Read further to gain knowledge in depth.


Category:

JEE Main Difference Between

Content-Type:

Text, Images, Videos and PDF

Exam:

JEE Main

Topic Name:

Difference Between Atoms and Ions

Academic Session:

2024

Medium:

English Medium

Subject:

Chemistry

Available Material:

Chapter-wise Difference Between Topics


Defining Atom 

An atom is the smallest unit of matter that retains the unique properties of a chemical element. It consists of a central nucleus composed of positively charged protons and uncharged neutrons, with negatively charged electrons orbiting the nucleus in specific energy levels or shells. The nucleus, densely packed with protons and neutrons, contains the majority of an atom's mass. The number of protons determines the element's identity, while the number of electrons balances the positive charge of the protons. Atoms are incredibly small, with diameters on the order of a few tenths of a nanometer. The characteristics of atoms are: 


  • Subatomic Particles: Atoms consist of subatomic particles, including protons, neutrons, and electrons. Protons carry a positive charge, neutrons have no charge, and electrons carry a negative charge.

  • Nucleus: At the center of an atom lies the nucleus, composed of protons and neutrons. The nucleus contains most of the atom's mass and carries a positive charge due to the presence of protons.

  • Electron Shells: Electrons orbit the nucleus in specific energy levels or electron shells. These shells are arranged in increasing energy levels, with electrons occupying the innermost shells before filling the outer shells.

  • Neutral Charge: Atoms are electrically neutral, meaning the number of protons in the nucleus is equal to the number of electrons orbiting it, balancing out the positive and negative charges.

  • Atomic Number: The atomic number represents the number of protons in an atom's nucleus and determines the element's identity.

  • Atomic Mass: The atomic mass of an atom is the sum of the masses of protons and neutrons in the nucleus.


Defining Ion

An ion refers to an atom or a group of atoms that have gained or lost electrons, resulting in a net positive or negative charge. When an atom gains electrons, it becomes a negatively charged ion called an anion. Conversely, when an atom loses electrons, it becomes a positively charged ion known as a cation. Ions play a vital role in chemical reactions and the formation of compounds. The electrical charges of ions enable them to attract and interact with other ions or molecules, influencing the behavior and properties of substances. The characteristics of ions are: 


  • Charge: Ions have a net positive or negative charge resulting from the gain or loss of electrons. Cations have a positive charge, while anions have a negative charge.

  • Electron Configuration: Ions have different electron configurations compared to their corresponding neutral atoms. Cations have fewer electrons, while anions have more electrons.

  • Chemical Reactivity: Ions exhibit different chemical reactivity compared to neutral atoms. Their charges influence their ability to attract or donate electrons, affecting their interactions with other ions or molecules.

  • Electric Conductivity: Ions in solution or in an ionic compound can conduct electricity due to the movement of charged particles.

  • Formation of Ionic Compounds: Ions play a key role in the formation of ionic compounds by combining with oppositely charged ions through electrostatic attractions.

  • Stability: Ions seek to attain a stable electron configuration by gaining or losing electrons to achieve a full outer shell.


Atoms and Ions Differences

S.No

Category 

Atom 

Ion 

1

Definition

The smallest unit of a chemical element

Atom or group of atoms with a charge

2

Basis

The basic building block of matter

Gain or loss of electrons

3

Charge

Neutral

Positive or negative

4

Electron

Orbiting the nucleus

Gained or lost

5

Electron Configuration

Determines element's identity

Altered due to gain or loss of electrons

6

Chemical Reactivity

Determined by electrons arrangement

Influenced by charge


This table highlights the difference between atoms and ions, focusing on their definitions, the basis of distinction, charges, electron behavior, and chemical reactivity. Now, after reading this article, you can easily differentiate between atoms and ions. 


Summary 

Atoms and ions are fundamental units of matter, but they differ in their electrical charge. Atoms are neutral particles composed of protons, neutrons, and electrons, while ions are charged particles that have gained or lost electrons. The presence of an electrical charge distinguishes ions from atoms and influences their behavior in chemical reactions and interactions with other particles. Ions are formed by gaining or losing electrons, resulting in a charge, while atoms are the fundamental units of elements and remain neutral.

FAQs on Difference Between Atoms and Ions for JEE Main 2024

1. How are ions formed?

Ions are formed through a process called ionization, which involves the gain or loss of electrons by atoms or molecules. Ions are created when an atom gains or loses one or more electrons, resulting in a net positive or negative charge. This electron transfer can occur through various mechanisms, such as chemical reactions, exposure to electromagnetic radiation, or collisions with other particles. When an atom gains electrons, it becomes a negatively charged ion, called an anion. Conversely, when an atom loses electrons, it becomes a positively charged ion, known as a cation. 

2. How do atoms and ions contribute to electrical conductivity?

Atoms and ions contribute to electrical conductivity through the movement of charged particles. In conductive materials, such as metals or solutions with electrolytes, atoms lose or gain electrons to form ions. These ions are free to move within the material, allowing for the flow of electric charge. In electrolytes, dissolved ions facilitate the movement of charge. When a potential difference is applied, the mobile ions or electrons can migrate, creating an electric current. 

3. Are all ions charged?

Yes, all ions have a charge. By definition, an ion is an atom or a group of atoms that have gained or lost electrons, resulting in an imbalance between the number of protons and electrons. This imbalance gives the ion a net positive or negative charge. Positively charged ions are called cations, and they have more protons than electrons. Negatively charged ions are called anions, and they have more electrons than protons. It's important to note that the magnitude of the charge can vary, depending on the number of electrons gained or lost. 

4. How does the electron configuration of an atom determine its chemical behavior? 

The electron configuration of an atom refers to the arrangement and distribution of electrons in its energy levels or electron shells. This configuration significantly influences the chemical behavior of an atom. The outermost electron shell, known as the valence shell, plays a crucial role. Atoms tend to achieve a stable configuration by either gaining, losing, or sharing electrons to fill or empty their valence shell. The number of valence electrons determines an atom's reactivity and its ability to form chemical bonds. Elements with similar electron configurations in their valence shells exhibit similar chemical behavior, leading to the classification of elements into groups in the periodic table.

5. How do atoms and ions interact in chemical reactions?

Atoms and ions interact in chemical reactions primarily through the exchange, sharing, or transfer of electrons. Atoms consist of a nucleus containing protons and neutrons, surrounded by electrons in energy levels or orbitals. Ions are charged particles that have gained or lost electrons, resulting in a net positive or negative charge. Through processes such as ionic bonding and covalent bonding, atoms and ions form chemical bonds to achieve a more stable electron configuration. Ionic bonding involves the transfer of electrons, resulting in the formation of oppositely charged ions that attract each other. Covalent bonding occurs when atoms share one or more pairs of electrons, leading to the formation of molecules. These interactions enable the formation and breaking of chemical bonds, driving the rearrangement of atoms and ions and ultimately determining the outcome of chemical reactions.