Which of these is a physical property? A) ability to burn a piece of paper

B) pure sodium reacts violently with water

C) the boiling point of water is 100’C

D) helium does not tend to react with anything

What happens to isotopes that are unstable?

Scientists often have to deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each number in an alternate form.

If a sample of radioactive isotopes takes 600 minutes to decay from 400 grams to 50 grams, what is the half-life of the isotope?