Is arsenic rare

Answer 1

Not really. It's about as common as the rare earths (which, despite the name, are not actually all that rare).

On average, the Earth's crust is about 2 parts per million arsenic.

Answer 2

Arsenic is relatively common in the Earth's crust, but it is considered rare in its pure form. It is usually found in combination with other elements in minerals and ores. However, due to its toxic properties, it is not commonly used in everyday applications.