railway RRB Group D Mock Test Series 2024-25 General Science Chemistry Classification of Elements and Periodicity in Properties

_______ એ એકલ-પરમાંણ્વીય અણુનું ઉદાહરણ છે.

1
આર્ગોન
2
સલ્ફર
3
ફોસ્ફરસ
4
હાઇડ્રોજન
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