Californium which is element 98, and americium:) those are a couple!! Hope that helps
Radon is <span>not a source of air pollution related to human activities</span>
Answer:

Explanation:
Hello,
Based on the acting force that is applied horizontally, one can propose the following equation based on Newton's laws:

Nevertheless, since we've got a angled force, it becomes:

In this case,
accounts for the formed angle, so the horizontal acceleration turns out into:

Best regads.
Answer:
Sorry for disrespecting you but i don't know your language. I want to help but my problem is your language IM SO SORRY
Maybe if you put it in english i’ll answer.. nahh jp i’m fluent