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Beryl is a cyclic silicate mineral whose formula can be written as Beₙ Al₂ Si₆ O₁₈. What is the value of n?

1. 1
2. 2
3. 3
4. 4

Correct answer: 3

Solution

For the formula to be neutral, the sum of cation charges must equal the total anion charge of the 18 oxide ions (-36). Solving 2n + 6 + 24 = 36 gives n = 3.

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