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How many electrons may be accommodated in the first three energy levels?

How many electrons may be accommodated in the first three energy levels?
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How many electrons may be accommodated in the first three energy levels?

User Siva Pradhan
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The first energy level can hold 2 electrons after that all other energy levels hold 8 electrons which means 3 energy levels can hold 18 electrons 2+8+8=18
User Sven Tiffe
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