Sodium is not a radical, it is an element. Chemists use the term radical to refer to small groups of atoms, such as the nitrate or phosphate or ammonium radicals, which tend to remain together as a group even when undergoing chemical reactions. A single atom, such as a sodium atom, is not a radical, it is just an element.
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There is no reasonable radical approximation for radical 11.
Not necessarily. If it is the same radical number, then the signs cancel out. Radical 5 times radical 5 equals 5. But if they are different, then you multiply the numbers and leave them under the radical sign. Example: radical 5 * radical 6 = radical 30
radical 30
a radical b or -a - radical b
98