Science 901 self test 2 study guide With Complete Answers.

proton - correct answer positively charged particles electron - correct answer 1. contained outside the nucleus 2. attract protons 3. negatively charged particles gamma ray - correct answer not affected by a magnet atoms - correct answer 1. mostly space 2. building block of matter solid - correct answer atoms nearly fixed in space liquid - correct answer flows freely but particles still attract gas - correct answer free to move in all space 3 characteristics of a solid - correct answer 1. has mass 2. has fixed shape 3. has volume 2 instruments used to measure radiation - correct answer 1. Geiger counter 2. Wilson cloud chamber The number of protons is called the __________. - correct answer Atomic number The atomic number of iron is 26 and the atomic mass is 56. The number of electrons is __________. - correct answer 26 Describe Becquerel's experiments leading to the discovery of radioactivity. - correct answer He discovered that the unseen rays of radioactive materials were causing photographic exposure. Describe way radiation can be detected and measured. Explain the instrument and expected results of using those instruments. - correct answer The Geiger counter counts radiation passing through an area of paper. Describe how each of the 3 types of radiation is affected by a magnet. - correct answer 1. Beta particles are bent sharply toward the north pole. 2. Alpha particles are bent slightly toward the south pole. 3. gamma rays are not affected.