The coordination numbers of oxygen and silicon in `SiO_(4)` respectively 

Options

A. a) 1, 2
B. b) 2, 1
C. c) 2, 4
D. d) 4, 2

Answer

To determine the coordination numbers of oxygen and silicon in SiO₄, we can follow these steps:

### Step 1: Understand the Structure of SiO₄
Silicon (Si) is the central atom in the SiO₄ molecule, and it is surrounded by four oxygen (O) atoms. Each oxygen atom is bonded to the silicon atom.

### Step 2: Determine the Coordination Number of Silicon
The coordination number of an atom is defined as the number of atoms (or ions) that are directly bonded to it. In SiO₄:
- Silicon is bonded to **four oxygen atoms**.

Thus, the coordination number of silicon (Si) is **4**.

### Step 3: Determine the Coordination Number of Oxygen
Next, we need to find the coordination number of oxygen in SiO₄. Each oxygen atom is bonded to:
- **One silicon atom** and can also bond to other atoms in a larger structure, but in the context of SiO₄, we consider only the direct bonds.

Thus, the coordination number of oxygen (O) is **2** (considering the bond with silicon and the potential for bonding with other atoms).

### Final Answer
The coordination numbers of oxygen and silicon in SiO₄ are:
- **Oxygen: 2**
- **Silicon: 4**

### Summary
- Coordination number of Silicon (Si): **4**
- Coordination number of Oxygen (O): **2**