For each gas is necessary a long answer; it is impossible to explain all in the Wiki Answers space, please read introductory manuals of inorganic/organic chemistry or search for each gas on Google or Wikipedia.

Radon has 86 protons and electrons; the number of neutrons is different for each isotope:

Number of neutrons = Atomic mass of the Rn isotope - 86

Radon is a noble or inert gas, and, as such, is resistant to compound formation. It can form radon difluoride, RnF2, and an oxide under certain circumstances, but it generally seeks to avoid any chemical bonding. Little is known about the fluoride and the oxide because radon is radioactive (meaning it's dangerous to work with), and the longest lived isotope, 222Rn, has a half-life of less than 4 days (meaning it's hard to "gather up a bit of radon" to study it). Need a link? You got it. Wikipedia has knowledge for free.

Radon inhalation, at high concentrations, for long periods of time can cause lung camcers.

Low places where there is little or no ventilation. Radon is "heavy" and can accumulate from sources in rocks or soil in locations where there is a "low place" like a crawl space or basement that has little to no air movement in the space.

Radon is a colorless gas and doesn't burn.

Yes, because radon is a radioactive gas; but in the nature it is impossible to find radon as gas or solid.

Radon would be dangerous whether it was Solid or a Liquid. However Radon is a noble gas meaning it cannot be found. It is radiocative and doesnt contribute to the Natural Background Radiation.

It doesn't cause air pollution, it is air pollution.

It's a radioactive decay product (of radium) that occurs in granite.

Not a problem unless you have a stone cellar in your house,

if you do, radon leaches out. It's heavy and stays in the cellar and every time you go down there you get another dose.

Radon is formed by the decompostion of Radium and/or Uranium which means that a source of either element is decomposing underneath you. The only real way to eliminate it is to remove it form underground. A good method to reduce radon is to open windows (if there are any) to let the gas escape

No. Radon is odorless.

If you are asking about Radon, there aren't any sypmtoms. You just develop some form of lung cancer. The chances are low, maybe three in 10,000 people exposed per year, and epidemiology can't really separate those cancers from normal cancer occurances unless the number of people studied is huge. Just have a whole house Radon test done and have them put one test kit or meter under a glass or metal bowl to see how much the granite is contributing to the home's radon. If you are asking about heavy metal posioning, look up the various heavy metals on the internet. Arsenic, polonium, beryilium, chromium, and lead are some of the more common toxic heavy metals found in granite. One warning, other than geologists studying average local granites, there has been no research on what is in commercially sold granites. Right now, you can sell any granite regardless of it's toxicity or radiation levels. Sad business. For more info, use the link below. We have more info and experts on this subject than anyone else. You don't really expect the stone industry to study this do you?

Possible solutions for radon mitigation: good ventilation of the house, ventilation under the basement, plastic filter under the basement, good finishing of the basement and walls, etc.

No, any effect

Radium is a highly radioactive alkali metal. It undergoes alpha decay, which is radioactive decay by the release of an alpha particle from a nucleus. The alpha particle is a helium-4 nucleus, and it can do a lot of damage. If an individual is up against a radium source, or if he ingests or breathes radium, he will have tissues exposed to the extremely destructive radiation. That's what makes radium so dangerous. That and the fact that its radioactive decay daughters are also radioactive, and an individual exposed to radium and having that radium decay (causing biological damage) will then face the radiation hazards of the daughters of radium, because they are all radioactive, too. A link is provided to the Wikipedia article on radium.

Protons = 82

Neutrons = 214 - 82 = 132

So ratio of protons to neutrons = 82 : 132 or 1 : 1.61

Radon is a very radioactive and dangerous gas.

yes AS IT is a metal but why use i cant think

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Yes

No, exposure to radon gas, even a large amount, won't give you a headache. Radon is an inert or noble gas, and it is radioactive. Radon exposure is a bad thing as it is the second most common cause of lung cancer. But you won't be able to detect radon by any of your senses, and it will not directly cause you to be "sick" or for a "migrane" to appear. It will, after time, cause cancer because the radiation damage your lungs get from the long exposure. In the mean time, you won't feel a thing. At least not because of an exposure to radon gas.

radon only kills canerous cells

Radon-222 undergoes alpha decay to produce polonium-218as a daughter.

Radon has eight valence electrons. It's a noble gas, meaning that it does not react well with other elements.

In a geographical sense, just about everywhere. It is more common in certain areas than others. It's considerably heavier than air, so radon escaping from the ground into the atmosphere tends to collect in low places, particularly those which are enclosed and have little air circulation. Typically in a house the highest concentration of radon will be found in the basement.

And that's exactly the problem with radon exposure. It is a radioactive source, and it's airborne and hard to defend against. You can't see it, feel it or smell it. It enters the body through respiration and sometimes ends up staying around - and decaying inside a person. An individual so exposed experiences localized radiation damage to tissues. And radiation is a good cause of cancer. Radon is the second leading cause of lung cancer, and the 6th leading cause of cancer in the U.S. overall. Symptoms of radon exposure in the levels to which it is present in structures are not directly observable. That makes it very important to test and to apply an effective mitigating stategy ASAP if a problem is discovered. Don't institute any half measures on this one. It's important. Radiation is like sun burn - except the consequences are more dire. How much can you handle without major problems? The best idea is to expose yourself to none and then not have to worry about it. As stated, you can not see, smell or feel radon gas. You cannot sense it at all. It is a radioactive gas that causes damage to our cells deep within the lungs. Unlike carbon monoxide gas that has defined symptoms from increasing amounts of exposure, which are similar to the flu, radon gas exposure has none. Symptoms only show up with the onset of lung cancer, which is the only known health malady that radon gas causes. So instead of looking for symptoms to occur it is best to test your home.