Why this code is not working

Question

https://code.sololearn.com/cTnC77UyzqiP/?ref=app

Dictionary

Answer 1

You have to write comma( , ) after each element except last one and Write each element inside " " like hydrogen should be written as "hydrogen" otherwise you will get undefined.

Sample:-

"H" : ["hydrogen"],
"He": ["helium"],

Answer 2

Two things:
1. The names you have inside you list are undefined, put them between " ", so "H": ["hydrogen"] and so on
2. You forgot to put commas, between every two elements of dict there should be a comma