What did bohr hypothesize about the atom?

that the atom is a positive, solid sphere with electrons in it.
that the atom is one large solid particle.
that the atom is a nucleus only.
that the atom is a nucleus with electrons orbiting around it.

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.

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