Question

symbols of 20 elements with atomic number ​

Answer 1

Sorry but i have only 18 symbols with atomic mass....

Answer 2

hydrogen H 1

helium He 2

lithium Li 3

berrilium Be 4

boron B 5

carbon C 6

nitrogen N 7

oxygen O 8

flourine F 9

Neon Ne 10

sodium Na 11

magnesium Mg 12

almunium Al 13

silicon Si 14

phosphorus P 15

sulphur S 16

chlorine Cl 17

argon Ar 18

pottasium K 19

calcium Ca 20

hope the answer of the question