Chemical weathering a. is caused by freezing and thawing b. breaks apart rocks by physical processes c. occurs when chemical reactions dissolve or change the minerals in rocks d. none of above

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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