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Jerry/s Unit 2 Study

Unit 2

QuestionAnswer
1.) Who used the "Gold Foil" experiment with alpha particles? Rutherford
2.) Who discovered there are external negative electrons? Thomson
3.) Who was the first person to suggest an atom? Democratis
4.) Who was responsible for discovering the nucleus? Rutherford
5.) Who was responsible for proving that atoms existed, and came up with 4 postulates? Dalton
6.) Give the locations of the protons, neutrons, and electrons in an atom. Electrons- e- cloud, outside of nucleus. Protons and Neutrons- inside nucleus.
7.) Which is/are the largest, and smallest: protons, neutrons, or electrons? Protons and Neutrons are BIG. Electrons are SMALL
8.) Why ISN"T the mass number for oxygen 15.9994? Protons plus neutrons will give you the mass number. 15.9994 is the average mass.
9.) How do you find the number of neutrons in an atom? Mass-protons=neutrons
10.) How many groups are on the periodic table? 18
11.) How many rows are in the periodic table? 7
12.) Are groups horizontal or vertical? Vertical
13.) Are rows horizontal or vertical? Horizontal
14.) Look at your periodic table for #'s 14-16. How many protons and neutrons are in: 172Lu? Protons=71 Neutrons=101
15.) How many protons and neutrons are in: 175Lu? Protons=71 Neutrons=104
16.) How many protons and neutrons are in: 179Lu? Protons=71 Neutrons=108
Created by: Jstewart02005
 

 



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