Question

1to 30element of atomic mass no

Answer 1

hydrogen,helium,lithunium,berilium,boron,carbon,nitrogen,oxygen,fluorine,neon,sodium,magnesium,aluminium,silicon,phospurus,sulphur,argon,calcium,pottasium,scandium,titanium,vanadium,chromium,manganese,iron,cobalt,nickel,copper,zink