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What is 2s2?

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Anonymous

11y ago
Updated: 9/4/2022

Beryllium has atomic number 4, so 4 protons. The electronic configuration 1s2 2s2 has 2 electrons in the 1s shell and 2 electrons in the 2s shell, which is 4 electrons.

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Waldo Mayer

Lvl 13
3y ago

What else can I help you with?