To determine the number of neutrons present in an atom of Gallium-71, you can follow these steps:
1. Identify the atomic number of Gallium:
- Gallium is element number 31 on the periodic table.
2. Understand the notation for isotopes:
- The notation for an isotope includes the element name followed by the mass number. In this case, Gallium-71 means the isotope of Gallium with a mass number of 71.
3. Calculate the number of neutrons:
- To find the number of neutrons, subtract the atomic number from the mass number. The atomic number for Gallium is 31. So, for Gallium-71:
Neutrons = Mass number - Atomic number
= 71 - 31
= 40
Therefore, an atom of Gallium-71 has 40 neutrons.
