Atomic Structure Quiz - ICSE Class 8 Science

Free practice quiz: Atomic Structure (ICSE Class 8 Science). 50 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 8 Science practice quiz has 50 multiple-choice questions on Atomic Structure, and 50 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which subatomic particle carries a positive charge and is found in the nucleus of an atom?

   1. Electron
   2. Neutron
   3. Proton
   4. Photon
   Show answer

   Answer: C. Proton

   Protons are positively charged subatomic particles located in the nucleus of an atom. Electrons are negatively charged and orbit the nucleus. Neutrons have no charge and are also in the nucleus. Photons are particles of light.

2. If an atom has 8 protons and 8 neutrons, what is its mass number?

   1. 8
   2. 16
   3. 64
   4. It cannot be determined
   Show answer

   Answer: B. 16

   The mass number is the sum of protons and neutrons. In this case, 8 protons + 8 neutrons = 16.

3. The nucleus of an atom contains:

   1. Only protons
   2. Only neutrons
   3. Protons and neutrons
   4. Electrons and neutrons
   Show answer

   Answer: C. Protons and neutrons

   The nucleus of an atom is composed of positively charged protons and neutral neutrons.

4. What is the term for the region around the nucleus where an electron is likely to be found?

   1. Orbit
   2. Shell
   3. Orbital
   4. Energy level
   Show answer

   Answer: C. Orbital

   In modern atomic theory (quantum mechanics), electrons are described as existing in orbitals, which are three-dimensional regions of probability where an electron is most likely to be found. While shells and energy levels describe the energy of the electron, 'orbital' is the term for the specific region.

5. The concept of electron shells originating from Bohr's model implies that:

   1. Electrons occupy a continuous range of energies.
   2. Electrons can be anywhere in the atom.
   3. Electrons occupy discrete energy levels, with specific amounts of energy.
   4. Electrons are stationary in their orbits.
   Show answer

   Answer: C. Electrons occupy discrete energy levels, with specific amounts of energy.

   Bohr's model introduced the idea that electrons orbit the nucleus in specific energy levels or shells, and can only move between these levels by absorbing or emitting specific amounts of energy (quanta).

More questions in this quiz

Answers and explanations are in the full quiz.

1. The number of protons in an atom determines its:
2. What is the charge of an electron?
3. Which of the following represents the mass number of an atom?
4. Atoms of the same element that have different numbers of neutrons are called:
5. What force holds the protons and neutrons together in the nucleus of an atom?
6. An atom that has gained or lost electrons is known as an:
7. The electron shells or energy levels in an atom are designated by:
8. Which of the following subatomic particles has no electric charge?
9. The outermost electron shell of an atom is called the:
10. What is the atomic number of an element with 11 protons?
11. Which model of the atom proposed that electrons orbit the nucleus in specific, fixed energy levels?
12. An atom of Oxygen has an atomic number of 8. How many electrons does a neutral atom of Oxygen have?
13. Which statement about neutrons is correct?
14. What is the sum of protons and neutrons in an atom called?
15. If an atom has an atomic number of 17 and a mass number of 35, how many neutrons does it have?
16. Which of the following is NOT a subatomic particle found within the nucleus of an atom?
17. The electron configuration of an element describes:
18. Which term refers to the number of electrons in the outermost shell of an atom?
19. If an atom has the electronic configuration 2, 8, 1, how many valence electrons does it have?
20. What is the fundamental difference between isotopes of an element?
21. The model of the atom that described electrons orbiting the nucleus like planets around the sun was proposed by:
22. What is the approximate mass of a proton compared to an electron?
23. An atom with 10 protons and 10 electrons is:
24. The energy levels of electrons in an atom are quantized, meaning:
25. Which element has an atomic number of 6?
26. If an atom has 9 protons and 10 neutrons, and it has lost one electron, what is its charge?
27. Which of the following particles is considered a lepton in the Standard Model of particle physics?
28. An atom of Lithium has an atomic number of 3 and a mass number of 7. How many neutrons does it have?
29. Which statement about Rutherford's nuclear model is considered inaccurate by later models?
30. What happens to the atomic number of an atom when it gains two electrons?
31. Which of the following represents the element Sodium (Na)?
32. The Pauli Exclusion Principle states that:
33. An atom of Chlorine has an atomic number of 17. If a chlorine atom has 18 neutrons, what is its mass number?
34. Which model proposed that the atom is a positively charged sphere with electrons embedded in it?
35. What determines the chemical properties of an element?
36. An atom with an atomic number of 12 and a mass number of 24 has been ionized to have a +2 charge. How many electrons does it now have?
37. Which of the following is a fundamental property of a proton?
38. An atom has 7 protons and 8 neutrons. What is its atomic number and mass number respectively?
39. The probability distribution of an electron in an atom is described by:
40. Which element has the electron configuration 2, 8, 7?
41. What is the total number of subatomic particles in the nucleus of an atom of Helium-4?
42. When an atom absorbs energy, its electrons:
43. Which of the following is true about a neutron?
44. The atomic mass of an element is the weighted average of the masses of its:
45. If an atom has 9 protons and 10 electrons, what is its charge?

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