Atomic structure Quiz - ICSE Class 7 Science

Free practice quiz: Atomic structure (ICSE Class 7 Science). 51 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 7 Science practice quiz has 51 multiple-choice questions on Atomic structure, and 51 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?

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

   Answer: B. Proton

   Protons are positively charged particles found in the nucleus of an atom. Electrons are negatively charged and orbit the nucleus. Neutrons have no charge.

2. The electronic configuration of an element represents:

   1. The number of neutrons in the nucleus
   2. The arrangement of electrons in different energy shells or orbitals
   3. The total number of nucleons
   4. The charge of the atom
   Show answer

   Answer: B. The arrangement of electrons in different energy shells or orbitals

   Electronic configuration describes how electrons are distributed among the various atomic orbitals and energy shells within an atom.

3. An atom with 17 protons and 18 neutrons is an isotope of an atom with 17 protons and 17 neutrons. What is the mass number of the first atom?

   1. 17
   2. 18
   3. 34
   4. 35
   Show answer

   Answer: D. 35

   The mass number is the sum of protons and neutrons. For the first atom, it is 17 protons + 18 neutrons = 35.

4. Which of the following elements is a noble gas and has a full outermost electron shell?

   1. Lithium (Li)
   2. Neon (Ne)
   3. Oxygen (O)
   4. Sodium (Na)
   Show answer

   Answer: B. Neon (Ne)

   Neon (atomic number 10) has an electron configuration of 2, 8, with a full outermost shell, making it a stable noble gas.

5. If an atom has 6 protons and 7 neutrons, what is its atomic number?

   1. 6
   2. 7
   3. 13
   4. 1
   Show answer

   Answer: A. 6

   The atomic number is defined by the number of protons in the nucleus. This atom has 6 protons, so its atomic number is 6.

More questions in this quiz

Answers and explanations are in the full quiz.

1. What determines the atomic number of an element?
2. An atom that has gained one or more electrons is called a(n):
3. The mass number of an atom is the sum of:
4. Which of the following describes an isotope?
5. The region around the nucleus where electrons are most likely to be found is called:
6. What is the charge of a neutron?
7. If an atom has 6 protons and 6 neutrons, what is its mass number?
8. An atom with 10 protons and 11 neutrons is an isotope of an atom with 10 protons and 10 neutrons. What is the atomic number of this element?
9. Which subatomic particle is responsible for the chemical properties of an element?
10. What is a valence electron?
11. An atom loses an electron. What is the resulting charge of the ion?
12. Which element has an atomic number of 11?
13. The Bohr model of the atom proposed that electrons:
14. An atom of Helium (He) has an atomic number of 2 and a mass number of 4. How many neutrons does it have?
15. Which of the following represents a stable electron configuration for most atoms?
16. What does the atomic symbol 'C' represent?
17. If an atom has 3 protons, 3 electrons, and 4 neutrons, what is its mass number?
18. What is the term for the positively charged center of an atom?
19. How many electrons does a neutral atom of Nitrogen (atomic number 7) have?
20. The arrangement of electrons in shells is governed by:
21. What is the fundamental unit of matter that retains the chemical properties of an element?
22. Which scientist is credited with the discovery of the electron?
23. If an atom has an electron configuration of 2, 8, 1, how many valence electrons does it have?
24. An element with 8 protons and 8 neutrons would have:
25. What is the primary role of neutrons in the nucleus of an atom?
26. An atom with 12 protons and 12 electrons is:
27. The nucleus of an atom contains:
28. An atom that loses two electrons will become a(n):
29. The atomic number of an element is also equal to the number of:
30. Which scientist proposed the nuclear model of the atom, with a dense, positively charged nucleus?
31. If an atom has 9 protons and 10 neutrons, what is its atomic symbol likely to be?
32. What is the electron configuration of an atom with 11 protons?
33. An atom gains one proton. What happens to its identity?
34. Which of the following particles are found outside the nucleus of an atom?
35. An isotope of Carbon has a mass number of 14 and 12 neutrons. How many protons does it have?
36. The tendency of an atom to attract electrons towards itself in a chemical bond is called:
37. What determines the chemical behavior of an atom?
38. An atom with 10 protons and 10 electrons is neutral. If it loses one electron, what is the charge of the resulting ion?
39. Which of the following is a characteristic of a proton?
40. An atom with an atomic number of 6 has how many electrons in its neutral state?
41. The electrons in an atom are arranged in:
42. Which of the following represents an ion with a net positive charge?
43. An atom of Sulfur has an atomic number of 16. How many electrons does a neutral Sulfur atom have?
44. What is the primary force that holds the protons together in the atomic nucleus?
45. If an element has an atomic number of 13, it will have 13 what?
46. An atom with 9 protons and 9 electrons is neutral. If it gains one electron, what is the charge of the resulting ion?

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