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scoray [572]
2 years ago
6

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Chemistry
1 answer:
marshall27 [118]2 years ago
8 0

Answer:

based on my knowledge

B. 678.5 j

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It has the highest second ionization energy because it is very difficult to remove the electron from the 1s orbital.

Its atomic number is 3. The electronic configuration is 1s2 2S1

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