The question is incomplete, the elements to be arranged as required are shown in the image attached to this answer.
Answer:
K<Mg<P<O
Explanation:
Electronegativity is the ability of an atom of an element in a compound to attract the shared electrons of a bond towards itself. Atoms of highly electronegative elements tend to polarize a covalent bond leading to polar covalent bonds and dipole moments. Electronegativity increases across the period but decreases down the group hence the arrangement of elements in the answer provided above.
