Chemical element

Опубликовано: 22 Март 2026
на канале: Speaking Videos

Chemical,element
A,chemical,element,or,element,is,a,species,of,atoms,having,the,same,number,of,protons,in,their,atomic,nuclei,ie,the,same,atomic,number,,Z1,There,are,118,elements,that,have,been,identified,,of,which,the,first,94,occur,naturally,on,Earth,with,the,remaining,24,being,synthetic,elements,There,are,80,elements,that,have,at,least,one,stable,isotope,and,38,that,have,exclusively,radioactive,isotopes,,which,decay,over,time,into,other,elements,Iron,is,the,most,abundant,element,by,mass,making,up,Earth,,while,oxygen,is,the,most,common,element,in,the,crust,of,Earth2
Chemical,elements,constitute,all,of,the,ordinary,matter,of,the,universe,However,astronomical,observations,suggest,that,ordinary,observable,matter,is,only,approximately,15%,of,the,matter,in,the,universe:,the,remainder,is,dark,matter,,the,composition,of,which,is,unknown,,but,it,is,not,composed,of,chemical,elements3,The,two,lightest,elements,,hydrogen,and,helium,were,mostly,formed,in,the,Big,Bang,and,are,the,most,common,elements,in,the,universe,The,next,three,elements,lithium,,beryllium,and,boron,were,formed,mostly,by,cosmic,ray,spalchemical,elements,,chemical,element,table,,chemical,element,pt,,chemical,element,ag,crossword,,chemical,element,symbols,,chemical,elements,list,Chemical,element
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