An atom has the electron configuration of 1s^2 2s^2 2p^5. how many electrons are in that atom?

answer

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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i do not get it   at all