Radium is usually found in compounds. Since it is an alkaline earth metal it is to reactive to exist in its elemental states in most environments, and especially in Earth's oxidizing atmosphere.
Radium selenide is likely to be ionic because radium is a highly electropositive metal while selenium is a nonmetal. In an ionic compound, radium is likely to donate its electron to selenium to form a stable compound.
Boron is typically found in nature as a compound rather than in pure elemental form. Examples include borax, boric acid, and various borates.
Platinum is typically found in nature as a pure metal, rather than in a compound form. It is often mixed with other metals like palladium, rhodium, and iridium in the form of an ore called "platinum group metals."
Titanium is typically found in compound form, such as titanium dioxide, rather than in pure elemental form. It is commonly extracted from minerals like ilmenite and rutile, and then processed to obtain pure titanium metal.
Krypton is typically found in its pure form as a noble gas due to its inert nature and lack of reactivity with other elements. It does not readily form compounds with other elements.
In pure form.
helium doesn't form any compound
Radium is a radio active element which always undergoes nuclear fission and desentegration, and releases energy in the form of radiation. It is an element. There is no compound in it. It contains atoms of radium.
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 selenide is likely to be ionic because radium is a highly electropositive metal while selenium is a nonmetal. In an ionic compound, radium is likely to donate its electron to selenium to form a stable compound.
The chemical formula for radium oxide is RaO. Radium is a group 2 element, so it typically forms a +2 oxidation state. This compound is an ionic compound where radium is in the cation form and oxygen is in the anion form.
Boron is typically found in nature as a compound rather than in pure elemental form. Examples include borax, boric acid, and various borates.
The chemical formula of radium sulphate will be RaSO4, but this compound is not still prepared.
Radium is a radioactive element that is never found in its pure form in nature due to its highly reactive and unstable nature. It is typically found in minerals like uranium and thorium ores, and extracting pure radium requires complex and hazardous procedures.
No plural for radium.
Platinum is typically found in nature as a pure metal, rather than in a compound form. It is often mixed with other metals like palladium, rhodium, and iridium in the form of an ore called "platinum group metals."
The radium ion is Ra(2+).