Highest electropositive element in the periodic table is

Options

A. Cs
B. Rb
C. K
D. Na

Answer

To determine the highest electropositive element in the periodic table, we can follow these steps:

### Step 1: Understand Electropositivity
Electropositivity refers to the ability of an element to lose electrons and form positive ions (cations). Metals, particularly those in Group 1 of the periodic table, are known for their high electropositive character.

**Hint:** Remember that electropositivity is associated with metals and their tendency to lose electrons.

### Step 2: Identify Group 1 Elements
The elements in Group 1 of the periodic table include Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), and Cesium (Cs). These elements are known as alkali metals.

**Hint:** Focus on the alkali metals, as they are the most electropositive elements in the periodic table.

### Step 3: Compare the Sizes of the Atoms
As we move down Group 1 from Lithium to Cesium, the atomic size increases. This is because additional electron shells are added, making the outermost electron further from the nucleus.

**Hint:** Larger atomic size generally means that the outer electron is held less tightly by the nucleus, making it easier to lose.

### Step 4: Determine the Ease of Electron Loss
The ease of losing the outermost electron increases with the size of the atom. Therefore, Cesium, being the largest atom in Group 1, will lose its outermost electron more easily than the other elements in the group.

**Hint:** Consider the trend in atomic size and how it affects the ability to lose electrons.

### Step 5: Conclusion
Based on the above reasoning, Cesium (Cs) is the most electropositive element in the periodic table, as it can lose its outermost electron more easily than Lithium, Sodium, Potassium, or Rubidium.

**Final Answer:** The highest electropositive element in the periodic table is Cesium (Cs).