Which arrangement in relative size is correct? (< sign means 'smaller than')
proton < electron < neutron < atomic nucleus
atomic nucleus < proton < electron < atom
proton < neutron < atomic nucleus < electron
electron < neutron < atomic nucleus < atom

D. electron < neutron < atomic nucleus < atom

Explanation:

size of an electron = 2.82 * 10^{-15} m.

size of a neutron = 0.8 * 10^{-15} m.

size of a atomic nucleus = 1.56 *  10^{-14} m.

size of an atom  =  0.1 - 0.5 nanometers

hence if we compare the size of all components we will see size of an electron is the smallest and size of an atom is the largest.

electron < neutron < atomic nucleus < atom

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