Fission.
The center of an atom is called the nucleus.
The center of an atom is called a nucleus (nucleifor plural).Center of an atom is called the "Nucleus".
The smallest particle of an element is called an atom.
Simply "atom".
compounds
atom is called atom because atom can't be subdiviided into pieces
An atom is called an ion if there is a charge on it - positive or negative.
the positively charged part of an atom is called proton
A substance in which all the atoms are the same is called an "element".
An atom that gains or loses electrons is called an ion. When an atom loses electrons, it becomes positively charged and is called a cation. When an atom gains electrons, it becomes negatively charged and is called an anion.
The outer electrons of an atom are called valence electrons.
Nuclei Atom