Discovery of Subatomic Particles
Subatomic particles are the smaller particles inside an atom: electrons, protons, and neutrons.
Practice This ConceptMain explanation
Teacher explanation
Electrons have negative charge, protons have positive charge, and neutrons have no charge. Protons and neutrons are present in the nucleus, while electrons are arranged outside the nucleus in shells. At this level, proton and neutron masses are taken as nearly one unit each, while electron mass is very small in comparison.
Example
In a neutral carbon atom, 6 protons are balanced by 6 electrons, and common carbon has 6 neutrons.
Simple analogy
Proton positive, electron negative, neutron neutral.
Common confusion
Students often place protons in shells or write neutrons as negatively charged.
Exam tip
Remember charge, location, and relative mass together for each particle.
Study the discovery of subatomic particles diagram carefully
Use the labelled diagram to keep discovery of subatomic particles clear in short answers and revision.
What this diagram makes clear
This diagram keeps the labels and direction of discovery of subatomic particles in the right order.
Where this helps in exams
Use this for labelled diagram work and short exam answers on discovery of subatomic particles.
Revision cue
Revise discovery of subatomic particles through the labels before writing the answer.
Answer writing and exam use
1-mark use
Write the exact meaning of discovery of subatomic particles in one clean line.
2-mark use
Define discovery of subatomic particles and add one example or condition.
3-mark use
Explain discovery of subatomic particles, show the method or example, and mention the common mistake.
Practice this concept with focused MCQs
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