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If an atom had 7 electrons in second shell, it would need to ________ electron(s) to become stable.
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If an atom had 7 electrons in second shell, it would need to ________ electron(s) to become stable.

User Trickydisco
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1 electron.

Assuming that the second shell is its valence shell, it would need one more electron to have a fully filled valence shell with eight electrons. This allows it to achieve a stable electronic configuration of a noble gas.
User Lalith Mohan
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