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Electrons are kept in orbit around the nucleus by electromagnetic force because nucleus in the centre of atom is positively charged and attracts the negatively charged electrons.
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6.when the waves encounter a surface or other boundary that does not absorb the energy of the radiation and bounces the waves away from the surface.
7. An electron will only react with a proton in the nucleus via electron capture if there are too many protons in the nucleus. ... Each electron continues to flow in, out, and around the nucleus without finding anything in the nucleus to interact with that would collapse it down inside the nucleus.
8. liquid Freon
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