Nanoscale

Nanoscale refers to a particular size range used to measure things, specifically between 1 billionth of a meter (1 nanometer or 10^-6 meter) and 1 millionth of a meter (1,000 nanometers or 10^-9 meter). Nanoscale examples include a Rhinovirus (cause of the common cold), and the width of a DNA strand.

Neutrino

Fundamental particles that belong to the lepton group. They have no electric charge and do not interact with other particles except through the Weak force. They are very light and travel very fast. There are three kinds: electron neutrino, muon neutrino, and tau neutrino.

Neutron

A particle with no electric charge (neutral) made of 2 down quarks and an up quark. It is in the nucleus of most  atoms. Here are Ujana (up quark), Deena (down quark) and Rosa (down quark) in their neutron subatomic universe vehicle (SUV).

Nucleus

The small central part of the atom that contains neutrons and protons. Most of the mass of the atom comes from the nucleus.