I'm pretty sure what you're asking is which particle can you not pinpoint exactly, and the answer to that is the electron
H has exactly one atom of hydrogen.
Every single atom of sodium has exactly 11 protons in the nucleus.
The number of protons that are in the atom's nucleus gives the atom its atomic number.
No. Atoms of the same elements can have different numbers of neutrons.
An atom with 17 protons is chlorine. (It is unnecessary to say "exactly" because the number of protons can only be whole numbers.)
It could do if it had GPS.
It means the place where something is pinpoint exactly.
Not exactly. It just can give a possible date.
Yes, though i cannot pinpoint exactly where, it can be found in dragonlance campaign setting
It's difficult to pinpoint exactly when Medea was published, but it was written by Euripides, who produced it in 431 BCE.
H has exactly one atom of hydrogen.
No.
Exactly the mass of an atom expressed in atomic units of mass (u).
"neutral"
No. The word is "pinpoint".
The nucleus of an atom is positively charged. The electrons that orbit the nucleus are negatively charged to exactly the same degree, which makes the atom neutral.
Marijuana is grown and sold all over the world. It would be impossible to pinpoint where exactly "most" originates at.