Structure of The Atom (परमाणु की संरचना) Ch(4) Practice Quiz in Hindi Part – 2 || Class 9 Science Practice Quizzes in English Posted on February 28, 2025February 28, 2025 by Anshul Gupta0% 0 votes, 0 avg 0 Structure of The Atom (परमाणु की संरचना) Ch(4)Practice Quiz in Hindi Part – 2 || Class 9 Science Practice Quizzes in English 1 / 201. Which of the following is a correct electronic configuration of neon? A. 6, 2 B. 2, 6 C. 8, 2 D. 2, 8 explanation: Neon has 10 electrons. The first shell K-shell) can hold a maximum of 2 electrons, and the remaining 8 electrons occupy the second shell L-shell).2 / 202. Which of the following statements about isobars is true? A. They have the same number of neutrons. B. They have different mass numbers. C. They have the same atomic number. D. They have the same number of protons. explanation: Isobars are atoms of different elements that have the same mass number but different atomic numbers.3 / 203. Which of the following is an isobar of magnesium-24? A. Sodium-23 B. Silicon-28 C. Aluminum-27 D. None of the above explanation: Isobars have the same mass number. None of the other options have a mass number of 24.4 / 204. Which of the following is an isobar of potassium-39? A. Botha) andb) B. Argon-40 C. Calcium-40 D. None of the above explanation: Isobars have the same mass number. None of the other options have a mass number of 39.5 / 205. What is the valency of fluorine? A. 1 B. 2 C. 4 D. 3 explanation: Fluorine has 7 electrons in its outermost shell and needs to gain 1 electron to achieve an octet. Therefore, its valency is 1.6 / 206. What is the valency of aluminum? A. 1 B. 3 C. 2 D. 4 explanation: Aluminum has 3 electrons in its outermost shell, which it can lose to achieve a stable octet. Therefore, its valency is 3.7 / 207. What is the valency of sulfur? A. 4 B. 2 C. 3 D. 1 explanation: Sulfur has 6 electrons in its outermost shell and needs to gain 2 electrons to achieve an octet. Therefore, its valency is 2.8 / 208. Which of the following is an isobar of argon-40? A. Calcium-40 B. Potassium-39 C. Titanium-42 D. Scandium-41 explanation: Isobars have the same mass number. Argon-40 and Calcium-40 both have a mass number of 40 but different atomic numbers.9 / 209. Which of the following statements about isobars is true? A. They have the same atomic number. B. They have the same number of neutrons. C. They have the same mass number. D. They have the same chemical properties. explanation: Isobars are atoms of different elements that have the same mass number but different atomic numbers.10 / 2010. Which subatomic particle was discovered by J. Chadwick? A. None of the above B. Proton C. Electron D. Neutron explanation: J. Chadwick’s experiments led to the discovery of the neutron, a neutral subatomic particle found in the nucleus of atoms.11 / 2011. Which of the following is a correct electronic configuration of oxygen? A. 2, 4 B. 2, 6 C. 6, 2 D. 4, 2 explanation: Oxygen has 8 electrons. The first shell K-shell) can hold a maximum of 2 electrons, and the remaining 6 electrons occupy the second shell L-shell).12 / 2012. Which of the following is an isotope of cobalt used in the treatment of cancer? A. Cobalt-59 B. Iron-59 C. Nickel-60 D. Cobalt-60 explanation: Cobalt-60 is a radioactive isotope used in radiation therapy for cancer treatment.13 / 2013. What is the maximum number of electrons that can be accommodated in the first shell K-shell)? A. 6 B. 8 C. 2 D. 18 explanation: The first shell K-shell) can accommodate a maximum of 2 electrons, according to the formula 2n^2, where n = 1 for the first shell.14 / 2014. Which of the following statements about isotopes is true? A. They have different chemical properties. B. They have different atomic numbers. C. They have the same number of neutrons. D. They have the same physical properties. explanation: Isotopes of an element have the same number of protons and electrons, which determine their chemical behavior. However, they differ in the number of neutrons, leading to slightly different physical properties.15 / 2015. What is the valency of chlorine? A. 1 B. 2 C. 4 D. 3 explanation: Chlorine has 7 electrons in its outermost shell and needs to gain 1 electron to achieve an octet. Therefore, its valency is 1.16 / 2016. What is the valency of sodium? A. 4 B. 3 C. 2 D. 1 explanation: Sodium has 1 electron in its outermost shell, which it can lose to achieve a stable octet. Therefore, its valency is 1.17 / 2017. What is the valency of carbon? A. 2 B. 3 C. 1 D. 4 explanation: Carbon has 4 electrons in its outermost shell and can either lose or gain 4 electrons to achieve a stable octet. Therefore, its valency is 4.18 / 2018. Which of the following is an isotope of uranium used as a fuel in nuclear reactors? A. Plutonium-239 B. Uranium-238 C. Thorium-232 D. Uranium-235 explanation: Uranium-235 is a fissile isotope used as a fuel in nuclear reactors.19 / 2019. What is the valency of silicon? A. 2 B. 3 C. 4 D. 1 explanation: Silicon has 4 electrons in its outermost shell and can either lose or gain 4 electrons to achieve a stable octet. Therefore, its valency is 4.20 / 2020. Which subatomic particle is not present in the nucleus of an atom? A. Electron B. All of the above C. Proton D. Neutron explanation: Electrons orbit the nucleus in electron shells or energy levels, while protons and neutrons are located within the nucleus.Please insert your information to see your ranking अपनी Ranking जानने के लिए कृपया अपनी जानकारी भरे NamePhone Number Your score isThe average score is 0% 0% Restart quiz Category: Class 9 Science Quizzes in English
