I think 3 of them are its been 1 half years since ive done this i dont take chemistry anymore
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Neils Bohr determined that electrons inhabit distinct energy levels.
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the mass number decreases by 4 and the atomic number decreases by 2
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They propagate in materialistic media and non-materialistic media ( space ) .
They propagate in the space at constant velocity , which is 3 × 108 m/s .
They consist of vibrating electric and magnetic fields at certain frequency in phase with each other , perpendicular to each other and perpendicular to the direction of the wave propagation ...
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welcome!
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<h2>Hey rose why you deleted my comments</h2>