Answer:
Third answer, or C
Step-by-step explanation:
To calculate the numbers of subatomic particles in an atom, use its atomic number and mass number: number of protons = atomic number. number of electrons = atomic number.
Dubnium Properties
Electrons: 105
Protons: 105
Neutrons: 157
Electron Configuration: [Rn] 5f14 6d3 7s2
Atomic Radius: 139 (estimated)
