Structure of Atom Quiz

Who discovered the electron?

• Ernest Rutherford

• James Chadwick

• J. J. Thomson

• Niels Bohr

The discovery of the proton is associated with the experiment involving:

• Cathode ray tube

• Gold foil experiment

• Beryllium bombardment

• Spectral line analysis

Neutrons were discovered by:

• J. J. Thomson

• Ernest Rutherford

• James Chadwick

• Niels Bohr

The Rutherford model of the atom proposed:

• A positively charged nucleus with electrons embedded in it.

• A dense, positively charged nucleus with electrons in well-defined orbits.

• Electrons existing in specific energy levels.

• Electrons occupying probability clouds around the nucleus.

The Bohr model of the atom:

• Introduced the concept of quantized energy levels.

• Described the atom as a dense, positively charged core.

• Explained the wave nature of electrons.

• Proposed the existence of subatomic particles.

According to the quantum mechanical model of the atom, the probability of finding an electron is described by:

• Atomic number

• Electronic configuration

• Orbitals

• Isotopes

The energy of an electron in an atom is:

• Continuous

• Quantized

• Dependent on mass only

• Independent of charge

The photoelectric effect demonstrates that light behaves as:

• Only a wave

• Only a particle

• Both a wave and a particle

• Neither wave nor particle

The de Broglie relation relates the wavelength (λ) of a moving particle with its momentum (p). What is the constant of proportionality?

• Planck's constant (h)

• Avogadro's constant (N)

• Mass of the electron (m)

• Speed of light (c)

The Heisenberg uncertainty principle states that it is impossible to know precisely the:

• Position and momentum of an electron simultaneously.

• Number of protons and neutrons in an atom.

• Electronic configuration of an element.

• Mass and charge of an electron.