Neutron stars are: Low density star remnants with a mass less than the mass of the Sun.

Incredibly small remnants of supermassive stars where the gravitational collapse is halted by neutron degeneracy.

Incredibly big and massive star remnants that expel all neutrons in a supernova explosion. Neutron stars are:

Ahypothetical metal has an orthorhombic unit cell for which the a, b, and c lattice parameters are 0.413 nm, 0.665 nm, and 0.876 nm, respectively. (a) if there are 8 atoms per unit cell and the atomic packing factor is 0.536, determine the atomic radius (in nm). (b) if the density is 3.99 g/cm3, calculate the metal's atomic weight (in g/mol).