What kind of uranium is used in atomic bombs? what are the proton and neutron numbers in the atoms?

The kind of Uranium used in atomic bombs like "Little boy" dropped in the Japanese city of Hiroshima is Uranium 235. 

-It has 92 protons therefore its proton number is 92
-It has 143 neutrons in the nucleus.
-The 92 protons + 143 neutrons make 235, so its nucleon number is 235.
  
Other important information.

- Its atomic number, which is determined by the number of protons in the nucleus is 92 since it has 92 protons in its nucleus.
- Atomic mass is 238.0289 amu
- number of electrons is 92
- number of energy levels is 7

Kiloleter, mega leterhope this !

Because its reliable.   there is no pollution  the chances of a radiation leak is low