Skip to content


Katherine and the ball

Once upon a time Katherine was going in a park. Suddenly a ball appeared out of thin air. She took it home and found out the mass of it. It was 203 g. She messaured the radius and it was 5,43 cm. She thought: “I wonder what the density of this mysteriuos ball?”

Can you help her with her problem and can you then find out what possible element the ball  could consists of?       

Posted in Group 8.