S4.1.2 Glossary Flashcards
Atomic model
A representation of the structure of the atom
Alpha particle
A particle made of 2 protons and 2 neutrons
Atomic number
The number of protons in an atom
Dalton’s atoms
Solid spheres which cannot be divided into smaller parts
Electron
A very small, negatively charged particle within an atom
Electronic structure
A representation of the number of electrons in each energy level
Energy level
Also known as shells, the orbit of an electron around a nucleus
Isotope
Atoms with the same atomic number but different mass number
Mass number
The number of protons and neutrons in an atom
Neutron
A neutral particle within an atom with a mass of one
Nuclear atom
A model of the atom containing a nucleus at its centre
Nuclei
The plural for nucleus
Nucleus
The centre of an atom which contains protons and neutrons
Plum pudding model
A ball of positive charge with negative electrons embedded in it
Proton
A positive particle within an atom with a mass of one
Radius
The distance from the outer edge of a circle or sphere to its centre
Relative charge
The charge of one particle compared to another
Relative mass
Mass of an element, taking into account the proportions of its isotopes
Subatomic particle
A small particle found within atoms, e.g. electrons, protons, neutrons
