Triad of transuranic element is

Options

A. Th, Np ,Pu
B. Bk, Cf, Fm
C. Tm, Nd , Pm
D. Pa, Fm, Md

Answer

To solve the question regarding the triad of transuranic elements, we will follow these steps:

### Step 1: Understand Transuranic Elements
Transuranic elements are defined as the elements that have atomic numbers greater than 92, which is the atomic number of Uranium.

### Step 2: Analyze the Given Options
We have the following options to analyze:
1. THNTPU
2. BK, CSFM
3. TMNDPM
4. PAFMMD

### Step 3: Identify Atomic Numbers
We need to identify the atomic numbers of the elements in each option:
- **THNTPU**:
- TH (Thorium) = 90
- NP (Neptunium) = 93
- PU (Plutonium) = 94
- **BK, CSFM**:
- BK (Berkelium) = 97
- CF (Californium) = 98
- FM (Fermium) = 100
- **TMNDPM**:
- TM (Titanium) = 22
- ND (Neodymium) = 60
- PM (Promethium) = 61
- **PAFMMD**:
- PA (Protactinium) = 91
- FM (Fermium) = 100
- MD (Mendelevium) = 101

### Step 4: Determine Which Groups are Transuranic
Now we will determine which groups contain only transuranic elements (atomic number > 92):
- **THNTPU**: Contains Thorium (90), which is not transuranic.
- **BK, CSFM**: All elements (Berkelium, Californium, Fermium) have atomic numbers greater than 92. This group is transuranic.
- **TMNDPM**: Contains Titanium (22), which is not transuranic.
- **PAFMMD**: Contains Protactinium (91), which is not transuranic.

### Step 5: Conclusion
The only group that consists entirely of transuranic elements is **BK, CSFM** (Berkelium, Californium, Fermium).

### Final Answer
The correct answer is **Option B: BK, CSFM**.

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