Total number of species which used all three p-orbitals in hybridisation of central atom and should be non-polar also.
`XeO_(2)F_(2), SnCl_(2), IF_(5), I_(3)^(+), XeO_(4),SO_(2),XeF_(7)^(+),SeF_(4)`

Explanation

To solve the problem of identifying the total number of species that use all three p-orbitals in hybridization of the central atom and are non-polar, we will analyze each compound given in the question.

### Step-by-Step Solution:

1. **Identify the Compounds**: The compounds we need to analyze are:
- XeO₂F₂
- SnCl₂
- IF₅
- I₃⁺
- XeO₄
- SO₂
- XeF₇⁺
- SeF₄

2. **Analyze Each Compound**:

**a. XeO₂F₂**:
- Hybridization: sp³d (4 sigma bonds + 1 lone pair)
- Geometry: Square planar
- Polarity: Polar (due to lone pair)

**b. SnCl₂**:
- Hybridization: sp² (2 sigma bonds + 1 lone pair)
- Geometry: Bent
- Polarity: Polar (due to lone pair)

**c. IF₅**:
- Hybridization: sp³d² (5 sigma bonds + 1 lone pair)
- Geometry: Square pyramidal
- Polarity: Polar (due to lone pair)

**d. I₃⁺**:
- Hybridization: sp³ (3 sigma bonds + 2 lone pairs)
- Geometry: Linear
- Polarity: Non-polar (dipoles cancel out)

**e. XeO₄**:
- Hybridization: sp³ (4 sigma bonds)
- Geometry: Tetrahedral
- Polarity: Non-polar (symmetrical geometry)

**f. SO₂**:
- Hybridization: sp² (2 sigma bonds + 1 lone pair)
- Geometry: Bent
- Polarity: Polar (due to lone pair)

**g. XeF₇⁺**:
- Hybridization: sp³d³ (7 sigma bonds)
- Geometry: Pentagonal bipyramidal
- Polarity: Non-polar (symmetrical geometry)

**h. SeF₄**:
- Hybridization: sp³d (4 sigma bonds + 1 lone pair)
- Geometry: Seesaw
- Polarity: Polar (due to lone pair)

3. **Count Non-Polar Species with All Three p-Orbitals Used**:
- From the analysis:
- I₃⁺: Non-polar
- XeO₄: Non-polar
- XeF₇⁺: Non-polar
- The species that satisfy the conditions (using all three p-orbitals and being non-polar) are:
- I₃⁺
- XeO₄
- XeF₇⁺

4. **Final Count**:
- Total number of species that use all three p-orbitals in hybridization and are non-polar: **3**

### Final Answer:
The total number of species which used all three p-orbitals in hybridization of the central atom and are non-polar is **3** (I₃⁺, XeO₄, XeF₇⁺).