If the atomic number of an element is 33, it will be placed in the periodic table in the

Options

A. 1st group
B. 3rd group
C. 15th group
D. 17th group

Answer

To determine the group placement of an element with atomic number 33 in the periodic table, we can follow these steps:

### Step 1: Write the Electronic Configuration
The first step is to find the electronic configuration of the element with atomic number 33. The electronic configuration can be written as:
- 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p³

### Step 2: Identify the Outermost Shell
Next, we identify the outermost shell of the element. The outermost shell for atomic number 33 is the fourth shell (n=4), which contains:
- 4s² 4p³

### Step 3: Count the Valence Electrons
Now, we need to count the number of valence electrons in the outermost shell. The valence electrons are:
- 2 (from 4s) + 3 (from 4p) = 5 valence electrons

### Step 4: Determine the Group Number
For p-block elements, the group number can be calculated using the formula:
- Group number = 10 + number of valence electrons
Substituting the number of valence electrons:
- Group number = 10 + 5 = 15

### Step 5: Conclusion
Based on the calculations, the element with atomic number 33 will be placed in the 15th group of the periodic table.

### Final Answer
The element with atomic number 33 will be placed in the **15th group** of the periodic table.

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