The diameter of a neutron is approximately 2.2* 10⁻⁶ nanometers. This diameter is between which two fractions of a nanometer?
O 1 billionth and 1 hundred-millionth
O 1 hundred-millionth and 1 ten-millionth
O 1 ten-millionth and 1 millionth
O 1 millionth and 1 hundred-thousandth