Answer:
Physical properties are used to observe and describe matter. Physical properties can be observed or measured without changing the composition of matter. These are properties such as <em>mass, weight, volume, and density.</em>
Phosphorus has 5 valence electrons
The answer is dv hypothesis ride a car instead of a bike
There's three types of decay: alpha beta and gamma.
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Alpha decay is the emission of a helium nucleus (2protons and 2 neutrons)
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Beta decay is the emission of an electron or a positron (
or
). It does affect the weight of the atom.
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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)