D. the last choice because the info above tells u so
C. Carrying a backpack to class
Velocity = distance /time
acceleration = velocity / time
The mass number of an isotope is the sum of the numbers of protons and the numbers of the neutron. Given that the mass number is 65 and the number of neutrons is 35, the number of protons is 30. The atom is then Zinc (Zn). The charge is equal to +2, as it lacks 2 more electrons.