what do you think you know about physics, physics is the study of matter under the effect of energy, but does this includes solid states bodies, atoms at ground states, object at microscopic size or object moving faster than light? these and more is what prompt me to ask again what is physics?
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solve 21885at→_____+42he
21885At→__ ___+42He
since it is an alpha decay, the daughter atom will
have its atomic number decreased by two and mass number decreased by 4.
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