Chemistry
The electronic arrangements of six atoms, A to F is shown below.
A: 2,5 B: 2 C: 2,6 D: 2,8,6 E: 2,8,8 F: 2,8,3
The atom which has the highest ionization potential:
- A
- B
- E
- F
Periodic Table
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Answer
B
Reason — The electronic configuration of six atoms is given below :
| Atom | Electronic configuration | Valence electrons |
|---|---|---|
| A | 2, 5 | 5 |
| B | 2 | 2 |
| C | 2, 6 | 6 |
| D | 2, 8, 6 | 6 |
| E | 2, 8, 8 | 8 |
| F | 2, 8, 3 | 3 |
Element B is helium, it has a completely filled outer shell, so helium has the highest ionisation potential. Element E also has completely filled outer shell, but it has 3 shells, so electrons are further away, hence it has lower ionisation energy than B.
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