Question

central part of the atom containing protons and neutrons * 1 point
dropdown with
ucleus\
the smallest particle of an element that retains the properties of that element * 1 point
dropdown with \choose\
this is a required question

Explanation:

The question is asking for the term that describes the smallest particle of an element that retains the properties of that element. In chemistry (a subfield of Natural Science), the atom is defined as the smallest particle of an element that still has the element's properties.

Answer:

atom