O Level Chemistry e-Book's MCQs - Complete
Proton and Nucleon Number App's Quiz & e-Book PDF Download - 290
Apps:
MCQ 290:
If the proton number is 19, the electron configuration will be
- 2,8,7
- 2,8,18
- 2,8,8,1
- 2,8,8,3
c
O Level Chemistry App & e-Book Tests PDF Download
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O Level Chemistry MCQs eBook Download
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