Which amongst the following is not an alkalne earth metal ?

Options

A. Mg
B. Ba
C. Fr
D. Sr

Answer

To solve the question "Which amongst the following is not an alkaline earth metal?", we will follow these steps:

### Step 1: Understand the definition of alkaline earth metals
Alkaline earth metals are the elements found in Group 2 of the periodic table. They are characterized by having two electrons in their outermost shell.

### Step 2: Identify the alkaline earth metals
The alkaline earth metals include:
- Beryllium (Be)
- Magnesium (Mg)
- Calcium (Ca)
- Strontium (Sr)
- Barium (Ba)

### Step 3: Analyze the options given in the question
To determine which element is not an alkaline earth metal, we need to compare the options provided in the question against the list of alkaline earth metals.

### Step 4: Identify the non-alkaline earth metal
If one of the options is an alkali metal (Group 1), such as Lithium (Li), Sodium (Na), or Potassium (K), that would be the correct answer since alkali metals are not alkaline earth metals.

### Step 5: Conclude the answer
Based on the analysis, if the options include an element like Lithium (Li), that would be the answer to the question as it is not an alkaline earth metal.

### Final Answer
The element that is not an alkaline earth metal is **Lithium (Li)** if it is one of the options provided.

---