1. What is a radioactive nucleus?
2. How is the atomic nucleus typically represented using symbolism notation?
3. What is the primary role of protons in the nucleus of an atom?
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.
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