it has a completely filled d-orbital that prevents d−d overlapping of orbitals
it has a completely filled d-orbital that causes d−d overlapping
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it has a completely filled s-orbital
Mercury is a liquid metal because it has a completely filled 6s orbital. Mercury has a unique electronic configuration which makes the outer orbital close to the nucleus. Hg80: 1s2,2s22p6,3s23p6,4s23d104p6,5s24d105p6,6s24f145d10
An f-shell poorly screens the nuclear charge that stbilizes the 6s orbital. Thus it is impossible to form any bond with other elements. So, mercury is unable to form bond like other solid metals and that's why it remains in liquid form.