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Chemistry Study Guide Chapter 3/21
Question | Answer |
---|---|
Gamma rays are? | Electromagnetic waves |
As the mass number of isotopes of an element increases, the nuber of preotons? | Remains the same |
An atom of potassium has 19 protons and 20 neutrons. What is its mass number? | 39 |
What are often used to monitor the approximate radiation exposure of people working with radioactive materials? | Film Badges |
The forces that hold the particles in the nucleus together are called? | Nuclear forces |
The discovery of the electron resulted from expirements using? | Cathode rays |
Which instrument detect radiation by counting electric pluses carried by ionized gas atoms? | Geiger-Muller counters |
All atoms of the same element have the same? | Atomic number |
How many significant digits are in 50.00000? | 7 |
In a glass tube, electrical current passes from the negative electrode, called the _______ to the other electrode. | Cathode |