7 is atomic symbol 9 is atomic density 8 is the atomic number
Radium and polonium is the answer to this question. I hope I helped out!
Answer:
D. The relationship between volume and moles
Explanation:
Amedo Avogadro found the relationship between the volume of a gas and the number of molecules contained in the volume.
The law states that "equal volume of all gases at the same temperature and pressure contains the same number of molecules or moles".
Mathematically:
V ∝ n (P,T constant)
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