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JEE Main Atoms and Elements — practice questions

Explore 28 free Atoms and Elements questions in JEE Main Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Atoms and Elements questions and exercises with answers

Showing questions 1–28 of 28.

Thomson measured which ratio for the electron?Read the answer and worked solution →Thomson determined the ratio by measuring the electrons':Read the answer and worked solution →The oil drop experiment was carried out between:Read the answer and worked solution →Rutherford's students in the scattering experiment were Geiger and:Read the answer and worked solution →The projectiles used in the scattering experiment were:Read the answer and worked solution →Most of the alpha particles passed through the foil:Read the answer and worked solution →A small fraction of the alpha particles were deflected by:Read the answer and worked solution →Roughly how many alpha particles bounced back?Read the answer and worked solution →Those particles that bounced back were deflected by nearly:Read the answer and worked solution →Atoms with the same mass number but different atomic number are:Read the answer and worked solution →Atoms with the same atomic number but different mass number are:Read the answer and worked solution →The difference between isotopes is due to the number of:Read the answer and worked solution →The hydrogen isotope having one proton and no neutron is:Read the answer and worked solution →What percentage of hydrogen atoms are protium?Read the answer and worked solution →The hydrogen isotope with one proton and one neutron is:Read the answer and worked solution →Deuterium makes up what percentage of hydrogen atoms?Read the answer and worked solution →The hydrogen isotope with one proton and two neutrons is:Read the answer and worked solution →A body that absorbs and emits all frequencies uniformly is a:Read the answer and worked solution →Who proposed the quantum theory in 1900?Read the answer and worked solution →The energy of a quantum of radiation is proportional to its:Read the answer and worked solution →Order the gold foil observationsRead the answer and worked solution →Isotopes or isobarsRead the answer and worked solution →Match each isotope to its nucleusRead the answer and worked solution →Work out the atomic numbersRead the answer and worked solution →True or false on atoms and elementsRead the answer and worked solution →Fill the gaps on atomic structureRead the answer and worked solution →Quick picks on atoms and elementsRead the answer and worked solution →Spot the one that does not fitRead the answer and worked solution →

Worked practice questions

Thomson measured which ratio for the electron?

  1. Charge to mass
  2. Charge to motion
  3. Change to mass
  4. Charge to matter
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Correct answer: A. Charge to mass

1. He measured how far electrons were deflected by fields. 2. Thomson was able to determine the value of the charge to mass ratio. 3. So the correct answer is charge to mass. _Source: syllabus Chemistry, Ch 2 'Structure of Atom'_

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Thomson determined the ratio by measuring the electrons':

  1. Deflections
  2. Reflections
  3. Refractions
  4. Diffractions
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Correct answer: A. Deflections

1. He varied the electric and magnetic field strengths. 2. He measured the amount of deflections observed by the electrons. 3. So the correct answer is deflections. _Source: syllabus Chemistry, Ch 2 'Structure of Atom'_

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The oil drop experiment was carried out between:

  1. 1846 and 1854
  2. 1906 and 1914
  3. 1806 and 1814
  4. 1926 and 1934
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Correct answer: B. 1906 and 1914

1. The experiment measured the charge on the electron. 2. It was carried out between 1906 and 1914. 3. So the correct answer is 1906 and 1914. _Source: syllabus Chemistry, Ch 2 'Structure of Atom'_

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More Chemistry topics

Aldehydes, Ketones and Carboxylic AcidsElectrochemistryStructure of AtomThe d- and f-Block Elements & Coordination CompoundsSolutionsRedox ReactionsUnit 2B1: Transition Metals & Coordination CompoundsChemical Kinetics