Quizlet

Flashcards: Atomic Structure Vocabulary

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AtomsThe smallest unit of an element.
SubatomicA term that means 'smaller than an atom'.
NucleusThe center of an atom.
ProtonA positively charged subatomic particle.
NeutronA subatomic particle with no charge
ElectronA negatively charged subatomic particle.
Particlea very small piece of something
Electron CloudEmpty space around the nucleus of an atom where electrons travel
ThomsonThe man who discovered the electron.
RutherfordThe man who discovered the nucleus of an atom.
Gold Foil ExperimentThe experiment conducted by Ernest Rutherford to discover the nucleus of an atom.
QuarksThe particles that make up protons and neutrons.
Mass NumberThe total number of protons and neutrons in the nucleus of an atom.
IsotopesThe term given to atoms of the same element that have different numbers of neutrons.
TransmutationThe process that occurs when an atom undergoes radioactive decay.
Half-lifeIn atoms that are radioactive, the time required for half of the element to decay.
DecayTo break into smaller pieces.
Atomic NumberThe number of protons in an atom.
Cathode Ray TubeA Piece of Equipment used by Thomson to discover the electron.
BohrThe man who discovered electron energy levels.
Electron Cloud ModelThe current model for atomic structure.
Beta ParticleThe term given to 'loose' electrons that come from radioactive decay.
Alpha ParticleThe term given to a particle consisting of two neutrons and two electrons, that comes from radioactive decay.
ElementA form of matter that cannot be separated into simpler substances by ordinary chemical methods.