riddle - I consist of three things. What am I?

I am made up of 3 things,

of which 2 things are same.

I have a total of 10 something inside me.

If you see me properly, I am a palindrome.

What am I?

Answer

Possibly you are

Water

I am made up of 3 things, of which 2 things are same.

You are made of 2 atoms of Hydrogen and 1 atom of Oxygen

I have total of 10 something inside me.

A water molecule has 10 protons (8 from oxygen and 2 from hydrogen).

If you see me properly, I am a palindrome..

Written chemically as $$ H - O - H$$ which is similar backwards even if the water molecule has a V-shape.