Atomic Structure — Introduction

Grade 8 Science — Atomic Structure — Introduction: 25 practice questions with instant scoring and explanations.

1. The smallest particle of an element that has all the properties of that element is:
2. A molecule is:
3. An element is a substance composed of:
4. A compound is formed when:
5. Which of the following is a mixture?
6. A mixture differs from a compound in that:
7. Atomic number is defined as:
8. Mass number of an atom is:
9. The number of electrons in a neutral atom is equal to:
10. Atoms of the same element with different numbers of neutrons are called:
11. The nucleus of an atom contains:
12. Electrons are arranged in atoms in:
13. The first electron shell can hold a maximum of:
14. The second electron shell can hold a maximum of:
15. An atom with an electronic configuration 2, 8, 1 has how many valence electrons?
16. The ionic representation of an atom that has lost electrons is:
17. An anion is formed when an atom:
18. The charge on an electron is:
19. The charge on a proton is:
20. The relative mass of a neutron is approximately equal to:
21. The mass of an electron is approximately:
22. If an atom has 6 protons and 8 neutrons, its mass number is:
23. The name given to the region around the nucleus where electrons are found is:
24. Which of the following statements about atomic structure is correct?
25. The smallest unit of a compound is: