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The first ionization potentials (eV) of B and Be respectively are:

1. 8.29, 9.32
2. 9.32, 8.29
3. 8.29, 8.29
4. 9.32, 8.29

Correct answer: 9.32, 8.29

Solution

Beryllium (Be) has a higher first ionization potential than Boron (B) due to its completely filled 2s orbital, which is more stable and requires more energy to remove an electron. Thus, the correct order is 9.32 eV for Be and 8.29 eV for B.

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