Atomic numbers of element \( \mathrm{A}, \mathrm{B}, \mathrm{C} \) and \( \mathrm{D} \) are 4, 1... VIDEO
Atomic numbers of element \( \mathrm{A}, \mathrm{B}, \mathrm{C} \) and \( \mathrm{D} \) are 4, 12, 17 and 19 respectively. Which among the given pair of elements belongs to the same period?https://bit.ly/YTAI_PWAP https://www.pw.live
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