Which nuclear reaction is classified as alpha decay

There's three types of decay: alpha beta and gamma.
*Alpha decay is the emission of a helium nucleus (2protons and 2 neutrons)
*Beta decay is the emission of an electron or a positron ( or ). It does affect the weight of the atom.
*Gamma decay is the emission of photons with a high energy. It does affect the weight of the atom.

To answer the question, any nuclear reaction which decreases the atomic weight by 4 and the protons by 2 is an alpha decay. (release of an alpha or helium nucleus)

The metal is named first

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