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The first electron energy level can only hold 2 electrons. Hydrogen only has 1 first energy level electron as it only contains one proton and one electron total.

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āˆ™ 12y ago
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āˆ™ 3mo ago

Each atom contains a specific number of electrons at the first energy level, which is also known as the K shell. Following the 2nĀ² formula, the first energy level can hold up to 2 electrons.

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Q: How many first level electron did each atom contains?
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