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How are cells with delimited nucleus called ? What are the main elements of the cell nucleus?

Cells with delimited nucleus are called eukaryotic cells. Organisms composed of one or more eukaryotic cells are called eukaryotes.

The mains elements of the cell nucleus are the chromatin (made of DNA molecules), the nucleolus, the karyolymph, or nucleoplasm, and the nuclear membrane (or karyotheca).

Do all eukaryotic cells have nucleus and only one nucleus?

There are eukaryotic cells without nucleus and others with more than one nucleus. Osteoclasts, the cells responsible for resorption of the osseous matrix, for example, are multinucleate cells; striated muscle fibers are multinucleate too. Red blood cells are example of enucleated specialized cells.

Of which substances is chromatin made?

Chromatin is made of DNA molecules associated to proteins called histones.