Given that the electronic configuration of an element X is 1s2 2s2 2p6 3s2 3p4,it can be deduced that X: a. belongs to group VI in the periodic table
b. belongs to period 4 in the periodic table
c. contains 3 unpaired electrons in the ground state
d. has atomic number 27

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf   

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