* Protons and Neutrons: The majority of an atom's mass is concentrated in its protons and neutrons, located in the nucleus.
* Atomic Mass Units (amu): Protons and neutrons each have an approximate mass of 1 atomic mass unit (amu).
Calculation:
* Protons: 5 protons * 1 amu/proton = 5 amu
* Neutrons: 7 neutrons * 1 amu/neutron = 7 amu
* Total Mass: 5 amu + 7 amu = 12 amu
Therefore, an atom with 5 protons and 7 neutrons has a mass of approximately 12 atomic mass units (amu).
Important Note: This calculation provides an approximate mass. The actual mass of an atom can be slightly different due to factors like the binding energy of the nucleus.
