The silicate anion in the mineral kinoite is a chain of three `SiO_(4)` tetrahedra, that share corners with adjacent tetrahedra. The charge pof silicate anion is

Options

A. `-4`
B. `-8`
C. `-6`
D. `-2`

Explanation

To determine the charge of the silicate anion in the mineral kinoite, we can follow these steps:

### Step 1: Understand the Structure of the Silicate Anion
The silicate anion in kinoite consists of three SiO4 tetrahedra that share corners with each other. Each SiO4 tetrahedron has one silicon atom (Si) and four oxygen atoms (O).

### Step 2: Determine the Total Number of Silicon and Oxygen Atoms
In the chain of three SiO4 tetrahedra:
- There are 3 silicon atoms (Si).
- Each tetrahedron has 4 oxygen atoms, but since they share corners, we need to calculate the total number of unique oxygen atoms.

### Step 3: Calculate the Unique Oxygen Atoms
When three SiO4 tetrahedra are connected:
- The first tetrahedron contributes 4 oxygen atoms.
- The second tetrahedron shares one oxygen with the first, contributing 3 additional unique oxygen atoms.
- The third tetrahedron shares one oxygen with the second, contributing 3 additional unique oxygen atoms.

Thus, the total number of unique oxygen atoms is:
- 4 (from the first tetrahedron) + 3 (from the second) + 3 (from the third) = 10 oxygen atoms.

### Step 4: Write the Formula for the Silicate Anion
The formula for the silicate anion in kinoite can be represented as Si3O10.

### Step 5: Determine the Charge of the Silicate Anion
Each silicon atom has a +4 charge, and each oxygen atom has a -2 charge. Therefore:
- Total charge from silicon: 3 Si x +4 = +12
- Total charge from oxygen: 10 O x -2 = -20

Now, we can calculate the overall charge of the silicate anion:
Overall charge = Total charge from silicon + Total charge from oxygen
Overall charge = +12 - 20 = -8

### Conclusion
The charge of the silicate anion in the mineral kinoite is -8.

### Final Answer
The charge of the silicate anion in the mineral kinoite is -8.

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