Question

define nucleus in short
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Answer 1

Answer:

the central part of an atom or of certain cells

Answer 2

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Nucleus: it is the centre of any atom (atom is the smallest thing at present) with a neutral charge, and it is surrounded by electron and protons with some force of attraction.

The nucleus found in eukaryotic cells. Inside its fully enclosed nuclear membrane.

a specialized structure occurring in most cells and separated from rest of the cell by a double layer nuclear membrane.

In terms of chemistry:

nucleus is the centre of a atom which only consist of neutral ions which is surrounded by proton and electron which are in circular motion inside the shell.