Name the elements with highest `EN` and with highest `EA` or `Delta_(eg)H^(ɵ)`.

Explanation

To answer the question regarding the elements with the highest electronegativity (EN) and the highest electron affinity (EA), we can break down the solution into clear steps:

### Step 1: Understanding Electronegativity (EN)
Electronegativity is defined as the tendency of an atom to attract a shared pair of electrons in a covalent bond.

### Step 2: Identifying the Trend in Electronegativity
- As we move from left to right across a period in the periodic table, electronegativity increases.
- Conversely, as we move down a group, electronegativity decreases.

### Step 3: Finding the Element with the Highest Electronegativity
- The most electronegative element is found in the top right corner of the periodic table.
- Based on the trends, **Fluorine (F)** is identified as the element with the highest electronegativity.

### Step 4: Understanding Electron Affinity (EA)
Electron affinity refers to the energy change when an electron is added to a neutral atom in the gaseous state. A more negative value indicates a greater tendency to gain an electron.

### Step 5: Identifying the Trend in Electron Affinity
- Generally, as we move from left to right across a period, the electron affinity increases.
- However, the size of the atom also plays a role; larger atoms may have different electron affinity values due to electron-electron repulsions.

### Step 6: Finding the Element with the Highest Electron Affinity
- Although Fluorine has a high electron affinity, **Chlorine (Cl)** has a slightly higher electron affinity than Fluorine due to its larger size, which allows for a more stable electron gain.
- Therefore, **Chlorine (Cl)** is identified as the element with the highest electron affinity.

### Final Answer
- The element with the highest electronegativity is **Fluorine (F)**.
- The element with the highest electron affinity is **Chlorine (Cl)**.

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