Proton — Science definition
Defined in 2 courses:
- A positively charged particle found in the nucleus. (Physical Science: Matter, Forces & Energy)
- A positively charged (+1) subatomic particle in the nucleus, with a relative mass of about 1 amu. (Physical Science: Chemistry)
Where it is taught
- Atomic Structure — Properties of Matter, Physical Science: Matter, Forces & Energy, Grade 8
- Atomic Models & Subatomic Particles — Atoms, Electrons & Periodicity, Physical Science: Chemistry, Grade 11
In use
Charge is a property associated with electric interactions; a proton’s positive charge and an electron’s negative charge have equal magnitudes.
Atomic Structure
Electrons carry a −1 charge but are almost weightless — roughly 1/1836 the mass of a proton — so essentially all of an atom's mass lives in that tiny nucleus while essentially all of its volume is electron cloud.
Atomic Models & Subatomic Particles
Questions using proton
Problem 1
Answer and explanation
Dissolving separates and disperses salt ions in water; it does not convert their nuclei into different elements. Proton counts and element identities remain unchanged.
Dissolving separates and disperses salt ions in water; it does not convert their nuclei into different elements. Proton counts and element identities remain unchanged.
Response criteria
- Use the supplied conditions and relevant evidence.
- Explain the scientific mechanism or calculation.
- State a meaningful limitation or testable next step.
Problem 2
- nucleus
- alpha particle
- neutron
- electron
Answer and explanation
electron
Electrons are almost weightless compared with protons and neutrons, so they contribute almost nothing to atomic mass.
Taught alongside
- atom
- neutron
- electron
- nucleus
- atomic number
- mass number
- isotope
- ion
- model
- evidence
- system boundary
- assumption
- atomic number (Z)
- mass number (A)