Nobelium facts for kids
Nobelium is a synthetic element with the symbol No and atomic number 102.
A radioactive metal, it is the tenth transuranic element and is in the actinide series of the periodic table. Twelve isotopes are known, and they are all short-lasting.
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Energy required to promote an f electron to the d subshell for the f-block lanthanides and actinides. Above around 210 kJ/mol, this energy is too high to be provided for by the greater crystal energy of the trivalent state and thus einsteinium, fermium, and mendelevium form divalent metals like the lanthanides europium and ytterbium. Nobelium is also expected to form a divalent metal, but this has not yet been confirmed.
See also
In Spanish: Nobelio para niños
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Nobelium Facts for Kids. Kiddle Encyclopedia.