technetium is the only element lighter than uranium that does not occur naturally. it is produced by neutron activation of molybdenum. fill in the correct isotopes to show how this process works.

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fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

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