The atomic number is the number of protons/electrons in an element. The atomic mass it the protons + the neutrons. So an atomic mass of 63.546 would round UP to 64. So, 64 - 29 = 35
Protons: 29
Electrons: 29
Neutrons: 35.
Because it has more neutrons than protons, it's an unstable element.
The growth in urban areas comes from both the increase in migration to the cities and the fertility of urban populations.The urbanization of the world is likely to slow population growth. It is also likely to concentrate some environmental effects geographically
