Where do you bump into the element arsenic in everyday life?

1. Arsenic is used in weed killers, and pesticides (poison for pests like mice/bugs), and other poisons

2. Arsenic can be used as a semi-conducter (Like boron)

3. Arsenic can be used in medical treatments (such as arsenic trioxide)

4. Arsenic is used as a wood preservative

5. Arsenic is used for alloying with copper and lead to form various useful materials