Nuclear weapons were used twice in combat against the Japanese Empire in 1945. In order to decisively end the Pacific War Hiroshima and Nagasaki became the only cities (in so far) to witness a nuclear Holocaust. Many nuclear tests have been conducted since, with hydrogen and neutron types also detonated. The last suspected nuclear tests were by North Korea in February 2013.
Many countries have nuclear weapons today including the United States. China, North Korea, South Korea, and Japan also have nuclear weapons.
They have no nuclear weapons
I think the use of nuclear weapons should be banned. They are to powerful and to many of them are out there. There are enough known nukes total to kill more than 5 times the actual amount of people in the world.
There were 23 total nuclear weapons tested at Bikini Atoll between the years of 1946 and 1958. These nuclear weapons caused a great amount of radiation to be leaked into the surrounding areas.
The United States does not give or sell nuclear weapons to any country. The United States has stationed nuclear weapons on the territory of many countries, but always retained full control of them.
It is difficult to provide an exact number as the use of nuclear weapons would have catastrophic global consequences, potentially leading to nuclear winter and widespread devastation. It is imperative to prevent the use of such weapons to protect life on Earth.
theoretically the yield of nuclear weapons is unlimited.
You can count them yourself in the related link on The Nuclear Weapon ArchiveA Guide to Nuclear Weapons
The US nuclear weapons arsenal is powerful enough to destroy the Earth multiple times over. The exact number of times would depend on the specific yield of each warhead and the total number of warheads available.
there are many harmful causes of nuclear weapons because whole hiroshima was destroyed of it
Many countries have nuclear weapons today including the United States. China, North Korea, South Korea, and Japan also have nuclear weapons.
zero
They have no nuclear weapons
none
No, China is not a nuclear-free zone. China possesses nuclear weapons and is one of the five recognized nuclear-weapon states under the Treaty on the Non-Proliferation of Nuclear Weapons.
Without nuclear weapons, another nation with nuclear weapons could launch an attack without worry of a retaliation. There are not that many ways of diverting a long-range ballistic missile.
Tens of thousands.