Number of s-block elements are:

Options

A. More than that of p-block elements
B. Equal to that of p-block elements
C. More than that of d-block elements
D. None of the above

Answer

To determine the number of s-block elements in the periodic table, we can follow these steps:

### Step 1: Identify the s-block elements
The s-block elements are found in Groups 1 and 2 of the periodic table. Group 1 consists of alkali metals, and Group 2 consists of alkaline earth metals.

### Step 2: Count the elements in Group 1
Group 1 includes the following elements:
1. Hydrogen (H)
2. Lithium (Li)
3. Sodium (Na)
4. Potassium (K)
5. Rubidium (Rb)
6. Cesium (Cs)
7. Francium (Fr)

This gives us a total of **7 elements** in Group 1.

### Step 3: Count the elements in Group 2
Group 2 includes the following elements:
1. Beryllium (Be)
2. Magnesium (Mg)
3. Calcium (Ca)
4. Strontium (Sr)
5. Barium (Ba)
6. Radium (Ra)

This gives us a total of **6 elements** in Group 2.

### Step 4: Calculate the total number of s-block elements
Now, we add the number of elements from both groups:
- Group 1: 7 elements
- Group 2: 6 elements

Total s-block elements = 7 (Group 1) + 6 (Group 2) = **13 elements**.

### Step 5: Analyze the options
Now we can analyze the options given in the question:
1. More than that of p-block elements
2. Equal to that of p-block elements
3. More than that of d-block elements
4. None of them

From the periodic table, we know:
- The p-block has 6 elements (Groups 13 to 18).
- The d-block has 10 elements (Transition metals).

Since the number of s-block elements (13) is more than the number of p-block elements (6) and also more than the number of d-block elements (10), the correct answer would be **"more than that of p-block element"**.

### Final Answer
The number of s-block elements is **13**.

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