Nucleus

It is perhaps a little indelicate to ask our Mother Earth her age,
but Science asknowledges no shame and from time to time has boldly
attempted to wrest from her a secret which is proverbially well guarded.

- Arthur Holmes, 1913


Concepts:
Atom
Protons
Neutrons
Electrons
Atomic Number
Atomic Mass (weight)
Isotope
Radioactive decay
Beta
Electron capture
Alpha
Halflife




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