Explain how the second period starts with lithium.
PYQ SSC JE (Junior Engineer) 2022
Explain how the second period starts with lithium.
- A.
When the second electron enters the 2s orbital
- B.
When the second electron enters the 2p orbital
- C.
When the third electron enters the 2p orbital
- D.
When the third electron enters the 2s orbital
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