Question

what is unusual about the electronic configuration of hydrogen​

Answer 1

Answer:

Hydrogen only has one electron and therefore has a configuration of 1s1. In order to fill it's energy level it only needs one more electron obtain a full outershell (1s2).

Answer 2

Answer:

It's instability.

Explanation:

Hydrogen has 1 electron.

So it may act as electropositive or electronegative

So it can be a metal or non metal

but mostly it's a metal.

but there is something known as metal hydrides .

Such exceptions make it unique ..