* Isotopes: Platinum has multiple isotopes, which are atoms of the same element with the same number of protons but different numbers of neutrons.
* Atomic Mass: The atomic mass of platinum (195.084 u) is an average of the masses of all its naturally occurring isotopes.
To find the number of neutrons in a specific platinum atom, you need to know its isotope. Here's how:
1. Identify the Isotope: You'll need to be given the specific isotope of platinum (e.g., Platinum-195).
2. Determine the Atomic Number: Platinum's atomic number is 78, meaning it has 78 protons.
3. Calculate the Number of Neutrons: Subtract the atomic number from the mass number of the specific isotope.
Example:
* Platinum-195:
* Mass number = 195
* Atomic number = 78
* Number of neutrons = 195 - 78 = 117 neutrons
