Answer:
Group 17, 2, 7, 7 electrons
Explanation:
4.2 g
The VOLUME of the ring is 4.2 - 4.0 = .2 ml = .2 cm^3
the MASS of the ring is this times the density
.2 cm^3 * 21 g/cm^3 = 4.2 g
Answer: The answer is B
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