Question

What are the names symbols and atomic numbers of first 20 elements and give at least one use of each elements

Answer 1

hydrogen helium lithium beriliyam chloride sodium oxygen fluoride sulphide potassium

Answer 2

Hydrogen -1, helium-2, lithium-3, berllyim-4, boron -5,carbon-4 , nitrogen -7, oxygen-8,fluorine-9, neon -10, sodium-11 ,magnesium -12, aluminium-13,
silicon-14,phosphorus_15, sulphur -16 ,chlorine-17 ,argon-18 , potassium -19, calcium -20. of these hydrogen is used as rocket fuels, carbon is used to obtain allotropes like diamond, graphiteetc. magnesium is a metal . calcium is present in milk. of these, neon, argon,helium are noble gases. metalloids are boron, silicon.