Radioactive nucleus — definition?
Unstable nucleus that spontaneously decays.
Atomic nucleus notation — format?
A/Z/X, with A superscript, Z subscript.
Protons — role?
Determine element and nuclear charge.
Mass number A — meaning?
Total nucleons (protons + neutrons).
Isotope — same?
Same Z, different A, different neutrons.
Isotope examples — oxygen?
O-16, O-17, O-18.
Beta plus particles — emitted?
Positron (positon) and neutrino.
Beta minus particles — emitted?
Electron (beta particle).
Alpha particles — composition?
Helium nucleus (2 protons, 2 neutrons).
Gamma radiation — type?
High-energy electromagnetic radiation.
Gamma rays — properties?
Penetrate matter, ionize atoms, high energy.
Radioactive activity — definition?
Disintegrations per second in a sample.
Z — represents?
Number of protons, element's charge.
A — represents?
Total number of nucleons in nucleus.
Isotopes — same?
Same Z, different A, same element.
Alpha decay — particles?
Helium nucleus (alpha particle).
Beta plus decay — particles?
Positron (positon).
Beta minus decay — particles?
Electron (beta particle).
Gamma radiation — emission?
Electromagnetic energy during decay.
Gamma ray properties?
Ionizing, penetrative, high energy electromagnetic waves.
Activity units?
Becquerel (Bq), disintegrations per second.
A nucleus — unstable?
Yes, it decays spontaneously.
Z — defines?
Element identity and charge.
A — indicates?
Mass number, total nucleons.
Teste tes connaissances avec un QCM de 12 questions sur Fundamentals of Radioactive Nuclei.
1. What is a radioactive nucleus?
2. How is the atomic nucleus typically represented using symbolism notation?
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