Niels bohr Study guides, Class notes & Summaries
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CLEP Chemistry Latest Update Graded A
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CLEP Chemistry Latest Update Graded A John Dalton Proposed that matter is composed of atoms; these atoms have different identities called elements, which combine to form compounds; measured masses of reactants and products. 
J.J. Thompson Observed deflection of particles in a cathode ray tube; proposed that atoms are composed of positive and negative charges; developed the plum pudding model of the atom 
Robert Millikan Calculated the charge-to-mass ratio of electrons using oil drops falling in ...
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Elements of Modern X-ray Physics Second Edition Jens Als-Nielsen Ørsted Laboratory Niels Bohr Institute Copenhagen University Des McMorrow London Centre for Nanotechnology University College London
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Elements of Modern X-ray Physics 
Second Edition 
Jens Als-Nielsen 
Ørsted Laboratory 
Niels Bohr Institute 
Copenhagen University 
Des McMorrow 
London Centre for Nanotechnology 
University College London
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CLEP Chemistry questions well answwred graded A+ 2023
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CLEP ChemistryJohn Dalton - correct answer Proposed that matter is composed of atoms; these atoms have different identities called elements, which combine to form compounds; measured masses of reactants and products. 
 
J.J. Thompson - correct answer Observed deflection of particles in a cathode ray tube; proposed that atoms are composed of positive and negative charges; developed the plum pudding model of the atom 
 
Robert Millikan - correct answer Calculated the charge-to-mass ratio of electr...
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OCR 2023 GCSE Combined Science Physics A Gateway Science J250/11: Paper 11 (Higher Tier) Question Paper & Mark Scheme (Merged)
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2 
© OCR 2023 
Section A 
You should spend a maximum of 20 minutes on this section. 
Write your answer to each question in the box provided. 
1 Which new feature of the atomic model did Niels Bohr suggest? 
A Electrons are in stable shells. 
B Electrons orbit a nucleus. 
C The atom has a nucleus. 
D The nucleus is positive. 
Your answer [1] 
2 Two rooms have the same fixed volume. They contain identical gases at the same pressure. 
Room H is at a higher temperature than room L. 
Which statement...
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TEST BANK FOR RADIOLOGIC SCIENCE FOR TECHNOLOGISTS 11TH EDITION BY BUSHONG
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MULTIPLE CHOICE 
 
 1. The term “atom” was first used by the ___________. 
a. Ethiopians 
b. British 
c. Greeks 
d. Romans 
 
 
ANS: C 
The term “atom” was first used by the Greeks 
 
DIF: Moderate REF: p. 27 
OBJ: Relate the history of the term “atom.” 
 
 2. The first person to describe an element as being composed of identical atoms was 
__________. 
a. J. J. Thomson 
b. John Dalton 
c. Dmitri Mendeleev 
d. Niels Bohr 
 
 
ANS: B 
The first person to describe an ele...
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AQA 2023 AS CHEMISTRY 7404/2 Paper 2 Organic and Physical Chemistry questions and answers verified
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AQA 2023 AS CHEMISTRY 7404/2 Paper 2 Organic and 
Physical Chemistry questions and answers verified 
What is the equation linking mass moles and MR? 
Mass=moles * MR 
What is the definition of Ar (relative atomic mass)? 
The average mass of an atom of an element compared to the mass of one twelfth of 
carbon 12. 
What does Mr stand for? 
Relative molecular mass 
Define relative isotopic mass. 
The mass of an isotope of an element compared to the mass of one twelfth of the mass 
of carbon 12 
...
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CLEP Chemistry Review Practice Questions 2024.
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CLEP Chemistry Review Practice Questions 2024. 
John Dalton - correct answer Proposed that matter is composed of atoms; these atoms have different identities called elements, which combine to form compounds; measured masses of reactants and products. 
 
J.J. Thompson - correct answer Observed deflection of particles in a cathode ray tube; proposed that atoms are composed of positive and negative charges; developed the plum pudding model of the atom 
 
Robert Millikan - correct answer Calculated ...
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CHEM 103: ATOMIC STRUCTURE>notes and problem set module 4.
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4.1: ATOMIC STRUCTURE 
Earlier in this course, we explored a very elementary view of atomic structure. We 
learned about protons, neutrons, and electrons (the three elementary particles that 
comprise an atom) and their properties. In this module, we will study these particles in 
detail and learn how their presence and arrangement determines the properties of all 
matter. 
The Electron 
During the 1800s, a number of scientists, including Sir Humphrey Davy, Michael Faraday, 
R. A. Milligan, G. J...
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LRA 211 Certification Exam Questions and CORRECT Answers
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Joseph (JJ) Thomson - Developed "plum pudding model" 
Interactions in x-ray tube - Happen at atomic level 
Ernest Rutherford - Model resembling tiny solar system 
Niels Bohr - Atoms have 3 particles Protons, Neutrons, and electrons 
binding energy - Energy needed to split up and atom 
Electron binding energy depends on - How close the electron is to the nucleus and how 
many protons are in the atom
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AQA 2023 AS CHEMISTRY 7404/2 Paper 2 Organic and Physical Chemistry questions and answers verified
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AQA 2023 AS CHEMISTRY 7404/2 Paper 2 Organic and 
Physical Chemistry questions and answers verified 
What is the equation linking mass moles and MR? 
Mass=moles * MR 
What is the definition of Ar (relative atomic mass)? 
The average mass of an atom of an element compared to the mass of one twelfth of 
carbon 12. 
What does Mr stand for? 
Relative molecular mass 
Define relative isotopic mass. 
The mass of an isotope of an element compared to the mass of one twelfth of the mass 
of carbon 12 
...
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