Radioactive yes, synthetic no. Radium is found in nature in very small trace amounts usually in uranium ore deposits.
Radium is strongly radioactive.
Rutherfordium is radioactive and a solid, liquid, and gas;)
Yes, radium and polonium are radioactive elements.
Radium is a solid, radon is a gas. Both are radioactive.
There are two radioactive alkaline earth metals: radium (Ra) and radium (Ra). Both elements have radioactive isotopes that undergo radioactive decay.
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.
Radium, by a big margin. Radium has no isotopes that are not radioactive, but no naturally occurring isotopes of potassium or sodium are radioactive.
The radioactive element that begins with the letter R is radium. Radium is a highly radioactive element and is found in uranium ores. It emits alpha, beta, and gamma radiation.
Radium and polonium are radioactive natural chemical elements.
Radium is not used to produce energy.
Yes. Radium is actually considered an alkaline earth metal. Its colour is nearly pure white, but when exposed to air, it turns black. Radium is also extremely radioactive. A link is provided to the Wikipedia article on radium.
Uranium and radium, and a number of others, are natural elements found in the ground, and they are radioactive.