Question

How do you tell which element/ molecule is the most reactive? (nonmetals)

1. H2O
2. O2
3. Cl
4. Kr
5. N2
6. CO2

Answer 1

The elements that are the most reactive on the periodic table should be located to the upper right hand corner of the table - these elements are the most electronegative.

Explanation:

In this case, it would be `"Cl"`, which has the highest electronegativity out of all the following elements & compounds, at `3.16` Pauling units. So, it would be the most reactive as well.

Source:

https://www.angelo.edu/faculty/kboudrea/periodic/trends_electronegativity.htm