if u r in 9th the best way to learn 20 elements....in sequence
(h-he)(li-be)(b-c-n-o-f)(ne)
(na-mg)(al-si)(p-s-cl-ar)(k-ca)
...just join these alphabets present in the brackets and learn it... you'll always remember it for eg..--haahee,liibee,baakknooff and so on....✌✌