Electronegativity is least for

Options

A. TI
B. Al
C. Ga
D. B

Answer

To determine which element has the least electronegativity among Thallium, Aluminium, Gallium, and Boron, we can follow these steps:

### Step 1: Understand Electronegativity
Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. The higher the electronegativity, the stronger the atom's ability to attract electrons.

**Hint:** Remember that electronegativity values indicate how strongly an atom can attract electrons in a bond.

### Step 2: Identify the Elements in the Question
The elements we are considering are:
- Thallium (Tl)
- Aluminium (Al)
- Gallium (Ga)
- Boron (B)

**Hint:** Make a list of the elements to keep track of them as you analyze their properties.

### Step 3: Recall the Electronegativity Values
The electronegativity values for the elements in the Boron family (Group 13) are as follows:
- Boron (B): 2.0
- Gallium (Ga): 1.6
- Aluminium (Al): 1.5
- Thallium (Tl): 1.8

**Hint:** Look for a reliable source or table that lists the electronegativity values for elements to compare them accurately.

### Step 4: Compare the Electronegativity Values
Now, let's compare the electronegativity values:
- Boron: 2.0 (highest)
- Thallium: 1.8
- Gallium: 1.6
- Aluminium: 1.5 (lowest)

**Hint:** Arrange the values from highest to lowest to easily identify which element has the least electronegativity.

### Step 5: Identify the Element with Least Electronegativity
From the comparison, it is clear that Aluminium has the lowest electronegativity value of 1.5 among the given elements.

**Hint:** Focus on the lowest value in your comparison to find the answer.

### Conclusion
The element with the least electronegativity among Thallium, Aluminium, Gallium, and Boron is **Aluminium**.

**Final Answer:** Aluminium (Al) has the least electronegativity.