Of course. If it is exposed to air or even skin, it can do majour damage. Ie. the nuclear explosion in Chernobyl.
Yes, but it is generally not a safe or healthy thing to do. It depends on just how radioactive the material is.
Not in the real world.
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As radium is radioactive, radium chloride would also be radioactive. Any compounds make with any radioactive material are radioactive, and they cannot be "not" radioactive. Radioactive material doesn't really care if it is "alone" or in compound; it will be radioactive in any case.
There is radioactive material in any country that has done nuclear tests. In The United States of America there were many tests. These were mostly in Nevada. If you were to get clearance to go to the test site you would see the craters everywhere.
One eighth would be left.
NIMBY
In radiometric dating, the amount of a certain radioactive isotope in an object is compared with a reference amount. This ratio can then be used to calculate how long this isotope has been decaying in the object since its formation. For example, if you find that the amount of radioactive isotope left is one half of the reference amount, then the amount of time since the formation of the object would be equal to that radioactive isotope's half-life.
If cancer is classified as 'extra arms', then the second one.
In one cycle, the material would be reduced to one half of the original, leaving one half of the material. In the second cycle (54/27 = 2), there would be 1/2 of that half, leaving 1/4 of the original material.
A fundamental property of radioactive material is that the atomic nucleus has an unstable configuration. The nucleus of a single atom of such material may break down at any instant, or may never break down at all, but with a large number of atoms in a collection, there is a statistical probability that half of them will break down in a given amount of time, which is known as the "half life" for that radioactive material. Exactly why this should be so is a mystery which cannot be adequately explained, but is observed and accepted as such. A deeper understanding of this phenomenon would probably give us a better insight into the true nature of the universe as a whole.
Well you could eat uranium or other or radioactive waste... But as Uranium is expensive and rare, and radioactive waste is deadly, eating radiation would result in killing you. This will not give you super powers like shown in cartoons, but it will end up with you receiving radiation poisoning.
No, there is no connection between radioactivity and magnetism. However if the radioactive material is magnetic, like iron for example, then this would be attracted to magnets, but this is entirely due to its physical nature and not to whether it is radioactive or not.
This would create a so-called 'dirty' bomb or, to use its official term, a radiological explosive device.