What does this symbol, 1/0N, mean?

A. an electron of negligible mass and one unit of charge

B. a position of negligible mass and one unit positive charge

C. a neutron of zero mass and one unit positive charge

D. a neutron of zero charge and one unit of mass

An element can be represented symbolically in terms of its atomic number and mass number as:

/[_{Z}^{A}/textrm{X}/]

where X = symbol of the element

A = atomic mass

Z = atomic number

In this case we have the representation as:

/[_{0}^{1}/textrm{n}/]

where n = symbol for neutron

mass number of neutron = 1

charge/atomic number of neutron = 0

Ans: D) A neutron of zero charge and one unit mass