Periodic Table

Step 1: Electron Affinity Trends.
Electron affinity refers to the energy released when an electron is added to a neutral atom in the gas phase. For halogens, electron affinity generally increases from left to right across the period but decreases down the group.
Step 2: Electron Affinity of Halogens.
- F₂ has the highest electron affinity, followed by Cl₂, then Br₂, and finally I₂. This trend is because as we move down the group, the atomic size increases, and the attraction between the nucleus and the added electron decreases, leading to a lower electron affinity.
Step 3: Increasing Order.

Step 1: Electronic Configuration of Krypton (Kr).
The atomic number of Kr is 36, and its electronic configuration is:
Step 2: Electronic Configuration of Xenon (Xe).
The atomic number of Xe is 54, and its electronic configuration is: