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Atomic Theory - Sample Test Question with Solutions, Exercises of Chemistry

Wabash CollegeChemistry

There are define the history of atoms: Dalton, Thomson and Bohr, sub-atomic particles and average atomic mass and Bohr diagrams and energy level diagrams.

Typology: Exercises

2021/2022

Uploaded on 03/31/2022

tarley
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ATOMIC'THEORY'–'SAMPLE'TEST'QUESTIONS'
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A.'History'of'the'Atom'
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1.'Dalton'C'First'to'believe'that'elements'are'made'up'of'extremely'small'particles'called'
“atoms”'
2.'Thomson'C'Discovered'that'atoms'have'negatively'charged'“electrons”'
3.'Rutherford'proved'that'the'atom'has'a'tiny,'positively'charged'nucleus'surrounded'by'
a'“cloud”'of'negatively'charged'electrons.'
4.'Bohr'C'Electrons'“orbit”'at'fixed'energy'levels'at'a'certain'distance'from'the'nucleus.'
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B.''SubCatomic'Particles'and'Average'Atomic'Mass:'
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1.'Calculate'the'average'atomic'mass,'given'the'data'for'the'naturally'occurring'
isotopes:'20Ne'(90.02%),'21Ne'(0.257%),'22Ne'(8.82%)'
' 20'(0.9002)'+'21'(0.00257)'+'22'(0.0882)'
' 18.004'+'0.05397'+'1.9404'='20'g'
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Partial preview of the text

Download Atomic Theory - Sample Test Question with Solutions and more Exercises Chemistry in PDF only on Docsity!

ATOMIC THEORY – SAMPLE TEST QUESTIONS

A. History of the Atom

  1. Dalton -­‐ First to believe that elements are made up of extremely small particles called “atoms”
  2. Thomson -­‐ Discovered that atoms have negatively charged “electrons”
  3. Rutherford proved that the atom has a tiny, positively charged nucleus surrounded by a “cloud” of negatively charged electrons.
  4. Bohr -­‐ Electrons “orbit” at fixed energy levels at a certain distance from the nucleus. B. Sub-­‐atomic Particles and Average Atomic Mass:
  5. Calculate the average atomic mass, given the data for the naturally occurring isotopes: 20 Ne (90.02%), 21 Ne (0.257%), 22 Ne (8.82%) 20 (0.9002) + 21 (0.00257) + 22 (0.0882) 18.004 + 0.05397 + 1.9404 = 20 g

C. Bohr Diagrams and Energy Level Diagrams

  1. Describe the three rules to be used for determining electron assignment: i) Aufbau Principle: Add electrons to lowest energy level first ii) Pauli Exclusion Principle: Maximum two electrons in each orbital subshell iii) Hund’s Rule: Electrons singly occupy orbitals, as 2nd^ electron added to subshells so that each electron has opposite spin
  2. Draw a Bohr Diagram AND Energy Level Diagrams for the following: a. Ca b. F-­‐