railway RRB ALP (CBT 1 + CBT 2 + CBAT) Mock Test Series 2025 (New) General Science Chemistry Classification of Elements and Periodicity in Properties

ଏକ ଉପାଦାନ X ର ପରମାଣୁ ସଂଖ୍ୟା କ’ଣ ହେବ ଯାହାକି ପିରିୟଡ଼ 2 ଏବଂ ଗ୍ରୁପ 17 ରେ ସ୍ଥାନିତ ହେବ?

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