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?
the
above are two isotopes , of bismuth , they both have an atomic number of 83 but
different mass number,bismuth-208
has125 neutrons while bismuth209 has
126 neutrons.
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