There is no Item ID for experience orbs in Minecraft. It does not go in your inventory, or you can't hold it in your hand. BUT you can use "Bottle of Enchanting" though, which is a potion that gives you experience, the same effect of an experience orb, it's ID is 384.
The item ID for a diamond pick in Minecraft is 278. I have linked you below in the related links of a full list of all the ID's in Minecraft.
The ID is : 49
The ID is 388.
The ID for diamond is 264.
I do
the id is 29
The number ID for TNT is; 46.
18
saving
you mean the id? the id is:278
If you mean endstone, the ID is 121