Question

What is an element that is crucial building block of DNA?

What is the element that makes up approximately 50% of bones mass?

What is the radioactive heavy metal, often considered as the most dangerous element?

What property does noble gases share? ​

Answer 1

1. Adenine, cytosine, guanine, or thymine.

2. Calcium

3. They are many different radioactive heavy metals, but the most dangerous elements is arguably Polonium.

4. They are all odorless, colorless, monatomic gases with very low chemical reactivity.