Structure of the Atom & Heat and Temperature is one of 9 topics in the Grade 10 Technical Sciences CAPS syllabus, covered across 3 lessons on Study Vault. Below are real practice questions from this topic with full worked answers.
Sample practice questions
Easy
1. Which subatomic particle carries NO electric charge?
Neutron
Proton
Electron
None -- all subatomic particles are charged
Answer: Neutron — The neutron carries no electric charge (it is neutral), unlike the proton (positive) and electron (negative).
Easy
2. How is the atomic number of an element defined?
The number of protons in the atom
The number of protons and neutrons in the atom
The number of electrons only
The total mass of the atom
Answer: The number of protons in the atom — The atomic number of an element is defined as the number of protons in the atom, which is unique to each element.
Medium
3. An atom has an atomic number of 11 and a mass number of 23. Calculate the number of neutrons in the atom.
Answer: 12 — Neutrons = mass number - atomic number = 23 - 11 = 12.
