Atomic and nuclear properties of materials:
Neutron (n)

Quantity	Value	Units	Value	Units
Atomic number	0	n	n	n
Mass	+/- 1.008 664 915 60 +/- 0.000 000 000 55	u	+/- 0.939 565 360 +/- 0.000 000 081	GeV
Nuclear density	mmmfew x 1015	g cm-3	n	n