There are essentially three different basic types of nuclear weapons:
This is a basic overview of the three different primary weapons, there are many variations and offshoots of these designs.
Specific details on all of these weapons designs are still highly classified.
That would vary from weapon to weapon.
None.
The UK is estimated to have a stockpile of approximately 160 active nuclear warheads and 225 nuclear warheads in total.
Hard to say. Many countries make nuclear weapons behind other countries backs. Some countries are not announcing when they complete testing or development for nuclear warheads, so the world may never know.
You can count them yourself in the related link on The Nuclear Weapon ArchiveA Guide to Nuclear Weapons
theoretically the yield of nuclear weapons is unlimited.
Neither. You would say 'Many types of weapons'
No, not all energy is nuclear. There are many types of energy, such as solar and kinetic.
There are over 400 nuclear reactors around the world.
nuclear energy
Your questions asks for an opinion. My opinion is no. The knowledge of how to build a nuclear weapon is out there. There are too many people with different views and values for nuclear weapons to just go away.
Answer 1If you are asking for nuclear weapons Pakistan is the only Islamic country who have nuclear weapons. However, Iran's nuclear program is rumored to be intending to create a nuclear weapon in the near future. Answer 2Pakistanis the only Muslim country having a nuclear weapon.Iran is never trying to have a nuclear weapon as the nuclear weapon is a kind of mass destruction weapons that are forbidden to use per Islam teachings (and other God religions) because this nuclear weapon kills the child, the woman, the old, and the plants and pollutes the universe.However, it is to be known also that also India, Israel, and North Korea have nuclear weapons in addition to USA, Russia, China, France, and UK.