Q. Number of protons, neutrons and electrons in the element 89X231 is
A. 89, 89, 242
B. 89, 142, 89
C. 89, 71, 89
D. 89, 231, 89
Answer: 89, 142, 89
Take Mock Tests
| Government Schemes Mock Test | Start Test! |
| Political Science Mock Test – 42 | Start Test |
| History Test – 190 | Start Test |
| Quantitative Aptitude Test | Start Test! | Data Interpretation - Mock Test | Start Test! |
| General Awareness - Mock Test | Start Test! |
| Reasoning Ability - Mock Test | Start Test! |
We will be happy to hear your thoughts