Chemistry Class 9: Understanding Atoms Quiz
10 Questions
3.5 Stars

Chemistry Class 9: Understanding Atoms Quiz

Delve into the world of atoms and their significance in chemistry class 9 with this quiz. Test your knowledge on the structure of atoms, subatomic particles like protons, neutrons, and electrons, isotopes, nuclear reactions, radioactivity, and ionization. Enhance your understanding of the fundamental units of matter.

Created by

Questions and Answers

इलेक्ट्रॉन्स के आस-पास परमाणु के नाभिक के चार्ज नकारात्मक होते हैं।


आइसोटोप्स में प्रोटॉनों की संख्या परिवर्तित होती है, जिससे तत्व की पहचान होती है।


नाभिक परमाणु के नकलन में ऊर्जा और कण उत्पन्न होते हैं।


रेडियोएक्टिविटी का दर समय के साथ कम होता है, पहले क्रम की अपघाति की मानकिका का पालन करता है।

<p>False</p> Signup and view all the answers

किसी भी पदार्थ के अणु को बिना उसकी विशेष गुणधर्मों को खोने के बिना भौतिक रूप से विभाजित नहीं किया जा सकता है।

<p>False</p> Signup and view all the answers

आयनीकरण प्रक्रिया में प्रोटॉन हार में होते हैं।

<p>False</p> Signup and view all the answers

न्यूट्रॉन एक सकारात्मक धर्माहीन सूक्ष्मअणु का हिस्सा है।

<p>False</p> Signup and view all the answers

प्रोटॉन के पास +1 के सकारात्मक चार्ज होती है।

<p>False</p> Signup and view all the answers

एलेक्ट्रॉन परमाणु के केंद्र में स्थित होते हैं।

<p>False</p> Signup and view all the answers

परमाणु सारणी में प्रत्येक तत्व के प्रोटॉनों की संख्या परमाणु संख्या निर्धारित करती है।

<p>False</p> Signup and view all the answers

Study Notes

Understanding Atoms: An Essential Part of Chemistry Class 9 Studies

Atoms play a crucial role in the study of chemistry. They are fundamental units of matter that cannot be physically divided without losing their characteristic properties. Understanding atoms is a prerequisite for grasping various chemical concepts, principles, and processes. Let's delve into the world of atoms and their significance in chemistry class 9.

Chapter 2: Structure of Atom

Chapter 2 of the chemistry class 9 syllabus introduces the basic structure of atoms. It explains that an atom consists of protons, neutrons, and electrons. Protons are positively charged particles located in the nucleus, while electrons have negative charges and orbit around the nucleus in distinct energy levels or shells. Neutrons are neutral particles that also reside in the nucleus.

Subatomic Particles


Protons are positively charged subatomic particles found in the nucleus of an atom. They are approximately 1.6 x 10^-24 grams in mass and carry a positive charge of +1. Protons are responsible for the atomic number of an element, which determines the position of an element in the periodic table.


Neutrons are neutral subatomic particles located inside the nucleus of an atom. Like protons, neutrons are massive, weighing approximately 1.6 x 10^-24 grams. They have no net electric charge and contribute significantly to the mass of an atomic nucleus.


Electrons are negatively charged subatomic particles that surround the nucleus of an atom. They have a mass of approximately 9.1 x 10^-31 kilograms and carry a negative charge of -1. Electrons are involved in the formation of chemical bonds and play a significant role in the properties of elements and compounds.


Isotopes are atoms of the same element that have different numbers of neutrons in their nuclei. This leads to variations in the mass of the element, but they share the same number of protons, determining the element's identity. For example, carbon-12 and carbon-14 are isotopes of carbon, while oxygen-16 and oxygen-18 are isotopes of oxygen.

Nuclear Reactions

Nuclear reactions involve changes in the nucleus of an atom. These changes can occur through either nuclear fission or nuclear fusion processes. Nuclear fission is the process by which the nucleus of an atom splits into smaller nuclei, releasing energy and particles in the process. Nuclear fusion is the process by which two atomic nuclei combine to form a new, more massive nucleus, releasing energy.


Radioactivity is the property of atomic nuclei to emit alpha, beta, or gamma particles, or to emit X-rays. This emission occurs due to the instability of the nucleus, which seeks to attain a more stable state. The rate of radioactivity decreases with time, following the first-order kinetics of decay.


Ionization is the process by which an atom or molecule acquires a positive or negative charge by losing or gaining electrons. This can occur through various interactions, such as collisions with electromagnetic radiation or other particles. Ionization plays a crucial role in the formation of ions and the formation of compounds.

Understanding the structure and behavior of atoms is a fundamental aspect of chemistry class 9. This knowledge lays the groundwork for comprehending the properties and interactions of elements and compounds, as well as the principles that govern various chemical reactions.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

More Quizzes Like This

Use Quizgecko on...