Atoms are composed of protons, neutrons, and electrons (discovered in 1897). Protons and neutrons make most of the atom's mass and all of its positive charge in the nucleus. Protons are subatomic particles that contain a positive charge. Essentially, they are hydrogen nuclei. Neutrons are subatomic particles that have the same mass as a proton but not charge. Electrons are subatomic particles with a negative charge that are found outside of the atom's nucleus. An element's atomic number provides its location on the periodic table as well as describe how many protons are in an atoms of... Show more

Atoms are composed of protons, neutrons, and electrons (discovered in 1897). Protons and neutrons make most of the atom's mass and all of its positive charge in the nucleus.

Protons are subatomic particles that contain a positive charge. Essentially, they are hydrogen nuclei.

Neutrons are subatomic particles that have the same mass as a proton but not charge.

Electrons are subatomic particles with a negative charge that are found outside of the atom's nucleus.

An element's atomic number provides its location on the periodic table as well as describe how many protons are in an atoms of that particular element.

More than 200 subatomic particles have been detected so far, and most appear to have a corresponding antiparticle.

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Class 11 Chemistry Practice Test: Structure of Atom - Discovery of Sub-atomic Particles

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10 Questions

1. The below model of organization of electrons in atom is given by ___________

RutherfordJ. J. ThomsonR. A. MillikanGalileo

2. Which of the following may be an incorrect statement regarding cathode ray discharge tube?

The magnetic field deflects these raysIt needs high voltagePresence of negative charge in cathode raysProtons are present in cathode rays

3. Pick out electron’s charge to mass ratio’s value from the options.

1.758823 × 1011 C kg1.758820 × 1011 C kg1.708820 × 1011 C kg1.758820 × 1011 C kg-1

4. What’s the mass of neutron in terms of electrons mass?

1/1838 times of electron’s mass1838 times of electron’s mass1832 times of electron’s mass1/1832 times of electron’s mass

5. Neutrally charged particles are protons.

FalseTrueMaybeDon't Know

6. ___________ is the lightest and smallest particles that’s obtained from hydrogen(that is a positive ion).

ProtonParticleNeutronElectron

7. Who did the oil drop experiment?

GalileoJ. J. ThomsonR. A. MillikanRutherford

8. Which of the following condition is suitable for cathode ray discharge tube?

Low pressure, low voltageLow pressure, high voltageHigh pressure, high voltageHigh pressure, low voltage

9. When cathode rays strike zinc sulfide coating, what did it create?

bright spotwhite lightblue lightuv rays

10. Thomson discovered that every substance in this universe is made up of ________ from his experiments.

electronsneutronsmassprotons