"nucleus"
"nucleus"
"nucleus"
human
Ionized atom Excited atom
The center of an atom is the atomic nucleus.
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".
Nucleus is at the center of atom. It is surrounded by electrons.
The nucleus, the center, of an atom is composed a protons and neutrons.
The center of an atom of any element is the nucleus.
When an atom has an electric charge it is called an ion.
Simply "atom".