MCQOPTIONS
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MCQOPTIONS
| 1. |
Which was the incomplete period in the long-form of the modern periodic table? |
| A. | 7<sup>th</sup> period |
| B. | 4<sup>th</sup> period |
| C. | 6<sup>th</sup> period |
| D. | 2<sup>nd</sup> period |
| Answer» B. 4<sup>th</sup> period | |