Select the correct statements :

Options

A. Based on reactivity series, occurrence of certain elements takes place in native state.
B. Due to the basic nature of oxides of alkaline earth metals, they combine with atmospheric acidic oxides giving salts.
C. Based on reactivity series, occurrence of certain of elements takes place in atomic state.
D. None of correct

Answer

To solve the question, we need to evaluate each statement provided and determine whether they are true or false based on the principles of chemistry, particularly focusing on the reactivity series and the occurrence of elements.

### Step-by-Step Solution:

1. **Evaluate Statement 1:**
- The statement claims that based on the reactivity series, certain elements occur in their native state.
- **Analysis:** The reactivity series ranks metals based on their reactivity. Metals like gold and silver, which are less reactive, are often found in their native state (uncombined with other elements) in nature.
- **Conclusion:** This statement is **true**.

2. **Evaluate Statement 2:**
- The statement suggests that due to the basic nature of alkaline earth metals, they combine with atmospheric acidic oxides to form salts.
- **Analysis:** Alkaline earth metals, such as magnesium, do react with acidic oxides (like sulfur dioxide) to form salts (like magnesium sulfate).
- **Conclusion:** This statement is also **true**.

3. **Evaluate Statement 3:**
- The statement claims that based on the reactivity series, certain elements occur in atomic state.
- **Analysis:** While some elements can be found in atomic form, many are found in combined states (e.g., sodium in rock salt, aluminum in bauxite). Therefore, not all elements occur in atomic state.
- **Conclusion:** This statement is **false**.

### Final Answer:
The correct statements are **A and B**.

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