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Atoms and isotopes key terms
Study Atoms and isotopes with curriculum-aligned Key Terms resources, practice links, and exam-focused support.
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key terms
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Topic
Atoms and isotopes
Key terms
atom
A very small particle that is the basic unit of a chemical element.
nucleus
The small central part of an atom that contains protons and neutrons.
nucleus
The small central part of an atom that contains protons and neutrons.
atom
The basic unit of a chemical element, consisting of a nucleus surrounded by electrons.
nucleus
The small central part of an atom that contains protons and neutrons.
proton
A positively charged subatomic particle found in the nucleus of an atom.
nucleus
The small central part of an atom that contains protons and neutrons.
atom
The basic unit of a chemical element, consisting of a nucleus surrounded by electrons.
electron
A negatively charged subatomic particle that orbits the nucleus of an atom in energy levels.
nucleus
The small, dense central part of an atom that contains protons and neutrons.
proton
A positively charged subatomic particle found in the nucleus of an atom.
neutron
A neutral subatomic particle found in the nucleus of an atom, contributing to its mass.
proton
A positively charged subatomic particle found in the nucleus of an atom.
neutron
A neutral subatomic particle found in the nucleus of an atom, contributing to its mass.
proton
A positively charged subatomic particle found in the nucleus of an atom.
electron
A negatively charged subatomic particle that orbits the nucleus of an atom.
Ion
An atom that has gained or lost one or more electrons, resulting in a net electrical charge.
Electron
A negatively charged subatomic particle that orbits the nucleus of an atom.
proton
A positively charged subatomic particle found in the nucleus of an atom.
neutron
A subatomic particle found in the nucleus of an atom that has no electrical charge.
neutral atom
An atom with an equal number of protons and electrons, resulting in no overall electrical charge.
charged ion
An atom that has gained or lost one or more electrons, resulting in a net electrical charge.
atomic number
The number of protons in the nucleus of an atom, which determines the element's identity.
mass number
The total number of protons and neutrons in the nucleus of an atom.
mass number
The total number of protons and neutrons in the nucleus of an atom.
atomic number
The number of protons in the nucleus of an atom, which determines the element.
mass number
The total number of protons and neutrons in the nucleus of an atom.
atomic number
The number of protons in the nucleus of an atom, which determines the element.
isotope
Atoms of the same element that have different numbers of neutrons.
mass number
The total number of protons and neutrons in the nucleus of an atom.
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