The atomic mass of titanium is not exactly 47.867 u. The atomic mass of an element is actually a weighted average of the masses of its isotopes, taking into account their relative abundance in nature.
Titanium has five naturally occurring isotopes: titanium-46, titanium-47, titanium-48, titanium-49, and titanium-50. These isotopes have masses of approximately 45.952, 46.951, 47.947, 48.947, and 49.944 atomic mass units (u), respectively.
To calculate the atomic mass of titanium, you need to consider the mass of each isotope and its abundance. The atomic mass is calculated using the following formula:
Atomic mass = (mass of isotope₁ × abundance of isotope₁) + (mass of isotope₂ × abundance of isotope₂) + ...
The atomic mass of titanium is typically reported as 47.867 u because it is the average atomic mass based on the natural abundance of titanium isotopes. This means that, on average, the mixture of titanium isotopes found in nature has an atomic mass close to 47.867 u.