Four elements \( \mathrm{A}, \mathrm{B}, \mathrm{C} \) and \( \mathrm{D} \) have atomic numbers ... VIDEO
Four elements \( \mathrm{A}, \mathrm{B}, \mathrm{C} \) and \( \mathrm{D} \) have atomic numbers \( 11,12,17 \) and 18 respectively. Out of these four elements two are solids while the other two are gases. One of the gaseous elements does not show chemical reactivity while the other is highly reactive.https://bit.ly/YTAI_PWAP https://www.pw.live
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