two atoms of the same element that are covalently bonded form a single bond.
two atoms of the same element that are covalently bonded form a single bond.
two atoms of the same element that are covalently bonded?
a single bond
Na
Na
lead is a soft metal (mh 1.5, but hardens close to melting) which, in many cases, is unable to support its own weight. it has a close-packed structure (bcn 12) but an abnormally large inter-atomic distance that has been attributed to partial ionisation of the lead atoms. it forms a semi-covalent dioxide pbo; a covalently bonded sulfide pbs; covalently bonded halides; and a range of covalently bonded organolead compounds such as the lead(ii) mercaptan pb(sch), lead tetra-acetate pb(chco), and the once common, anti-knock additive, tetra-ethyl lead (chch)pb. the oxide of lead in its preferred oxidation state (pbo; +2) is amphoteric; it forms anionic plumbates in strongly basic solutions. lead forms zintl phases such as cspb, srpb, lapbn and ybpb. it has reasonable to good corrosion resistance; in moist air it forms a mixed gray coating of oxide, carbonate and sulfate that hinders further oxidation.
post-transition metal