Which chemical element are we looking for? (EN)

Which chemical element are we looking for?

Here comes the first of seven hints of our riddle ‘The Story of an Element’:

Hint1

Hint 2:

Hint 3:

Hint 4:
Hint4

Hint 5:

Hint 6:

Hint 7:
Hint7

Here you can download all hints:
element_1.pdf (1.3 MB)
element_1.pptx (6.3 MB)
The Story of an Element I.waltz (6.8 KB)