Amongst the following, total number of metals which occur in the native state in the earth's crust are : Fe, Zn, Na, Au, Ni, Sb, Sn, Pt, Hg.

Explanation

To determine the total number of metals that occur in the native state in the Earth's crust from the given list (Fe, Zn, Na, Au, Ni, Sb, Sn, Pt, Hg), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Native State**:
- Native state refers to the natural occurrence of metals in their uncombined form, meaning they are not chemically bonded to other elements. This typically applies to metals with low reactivity.

2. **Identify the Metals in the List**:
- The metals provided are:
- Fe (Iron)
- Zn (Zinc)
- Na (Sodium)
- Au (Gold)
- Ni (Nickel)
- Sb (Antimony)
- Sn (Tin)
- Pt (Platinum)
- Hg (Mercury)

3. **Classify the Metals Based on Reactivity**:
- Metals that are commonly found in the native state are usually noble metals or those with very low reactivity.
- Noble metals include Gold (Au) and Platinum (Pt).
- Other metals listed (Fe, Zn, Na, Ni, Sb, Sn, Hg) are more reactive and typically found in compound forms rather than in their native state.

4. **Identify which Metals Occur in Native State**:
- From the list:
- Au (Gold) - occurs in native state.
- Pt (Platinum) - occurs in native state.
- The rest (Fe, Zn, Na, Ni, Sb, Sn, Hg) do not occur in native state due to their higher reactivity.

5. **Count the Metals in Native State**:
- The metals that occur in the native state are Au and Pt.
- Therefore, the total number of metals in native state = 2.

### Final Answer:
The total number of metals which occur in the native state in the Earth's crust from the given list is **2** (Au and Pt).

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