Among the elements of second period pick out the element
with the most negative electron gain enthalpy

Explanation

To determine which element in the second period has the most negative electron gain enthalpy, we can follow these steps:

### Step 1: List the Elements of the Second Period
The elements in the second period of the periodic table are:
- Lithium (Li)
- Beryllium (Be)
- Boron (B)
- Carbon (C)
...