CBSE Class 11 Chemistry Chapter-2 Important Questions - Free PDF Download















FAQs on Important Questions for CBSE Class 11 Chemistry Chapter 2 - Structure of Atom
1. What are Isotopes?
Answer: Isotopes are the variant atoms of the same element, which have the same number of protons and electrons but a different number of neutrons. Hence, isotopes of the same element have different nucleon numbers. In other words, isotopes are atoms of the same element, having the same atomic number and different mass numbers. Also, the isotopes of an element have similar physical properties but different chemical properties.
For example, Carbon has three isotopes, Carbon-12, Carbon-13, and Carbon-14. These atoms of carbon have mass numbers of 12, 13, and 14 respectively, whereas the atomic number of all three is 6.
2. What are Isobars?
Answer: Isobars are the atoms of various chemical elements, which have the same mass number but differ in atomic numbers. In other words, isobars have the same number of nucleons but have a different number of electrons. For example, Sulphur, Calcium, Potassium, Argon, Chlorine, the atoms of all these elements contain 40 nucleons each but have different numbers of electrons. The existence of isobars in the periodic table helps to determine the stability and radioactivity of various elements. Also, it may be so that the isotopes of different elements having the same atomic weights are isobars.
3. What are Isotones?
Answer: Isotones are the atoms of different elements, which have the same number of neutrons but different numbers of protons. For example, Boron and Carbon are isotones, having 7 neutrons in the nuclei, and a different number of electrons and protons. Again, chlorine and potassium make a pair of isotones, having 20 neutrons each, in their nuclei.
4. Can I Find Important Questions for CBSE Class 11 Chemistry Chapter 2- Structure of Atom Online?
Answer: Yes, you can find important questions for CBSE Class 11 Chemistry Chapter 2- Structure of Atom online on Vedantu. These important questions are curated and prepared by our subject matter experts, with close reference to the NCERT Chemistry textbook for Class 11 and various other reference study materials. Also, the important questions for the chapter Structure of Atom are available in the PDF format and you can download them for free. By going through these important questions, you will be able to revise all the important topics and their key points, as covered in this chapter. Hence, these important questions make a very useful study material for your exam preparation.
5. What are the main concepts given in Chapter 2 Structure Of Atom of Class 11 Chemistry?
Ans: Chapter 2 of Class 11 Chemistry is based on the structure of atoms and different constituents of atoms. Students will study the concept of isotopes, isotones, models of atoms suggested by different scientists, and other important information related to the atomic theory. Students can understand the main concepts of Class 11 Chemistry Chapter 2 using important questions given on Vedantu. Students can download all important questions for Class 11 Chemistry Chapter 2 by clicking here.
6. How were electrons discovered?
Ans: J. J. Thomson experimented on the cathode ray discharge tube. The experiment helped to discover electrons which are stated to be negatively charged particles present on the outer side of an atom. When high voltage is passed through electrodes present inside a glass tube, invisible rays are emitted which were named cathode rays by the scientist. The scientist analyzed the rays and this led to the discovery of electrons.
7. How important is Chapter 2 Structure Of Atom of Class 11 Chemistry for JEE Mains preparation?
Ans: Class 11 Chemistry Chapter 2 structure of atoms is important for the board exams and JEE mains preparation. Students have to understand the structure of atoms given by different scientists. They can get questions from the Chapter in the board exams and JEE Main paper. Therefore, they have to thoroughly revise and understand the concepts of the Chapter to prepare for their exams. They can refer to the important questions in Class 11 Chemistry Chapter 2 to learn the main ideas of the Chapter.
These solutions are available on Vedantu's official website(vedantu.com) and mobile app free of cost.
8. What do you know about the atomic number and mass number of Chapter 2 Structure Of Atom of Class 11 Chemistry?
Ans: The atomic number corresponds to the number of positive particles in it. It helps to differentiate the two given elements from each other. The protons and neutrons present in the nucleus of an atom form the mass number. In the periodic table, the elements are arranged according to the increasing atomic and mass number. The protons and neutrons are the two main particles that are found in the nucleus of an atom.
9. What is the significance of the number of electrons in an atom?
Ans: Electrons have a negative charge on them. They are found outside the nucleus. The number of electrons helps to determine the valency of an atom. The electrons are arranged in the order of two, eight, eight,--- and so on. The number of electrons present in the outermost shell of an atom helps to determine the valency of an element. An experiment was done by J. J. Thompson to discover the electrons.