Chapter 2

Question 2

John Dalton’s Atomic Theory Laws

Answer 2

1. Elements are composed of tiny, indestructible particles; atoms
2. atoms of a given element have the same mass and other properties, distinguishing them from other atoms
3. atoms combine in simple whole-number ratios to form compounds
4. atoms of one element cannot change into atoms of another element

Question 3

What was the cathode ray used for

Answer 3

The discovery of the electron by J.J Thomson. a beam of particles (cathode rays) traveled from a negatively charged electrode to a positively charged on

Question 4

Thomson found that the particles that compose the
cathode ray have the following properties

Answer 4

-they travel in straight lines

-they are independent of the composition of the material from which they originate

-they carry a negative electrical charge