Atomic Models
Physics ⇒ Modern Physics
Atomic Models starts at 9 and continues till grade 12.
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According to Bohr's model, the angular momentum of an electron in a stable orbit is quantized. State the formula for the quantization of angular momentum.
Describe one experimental observation from Rutherford's gold foil experiment that contradicted Thomson's model.
Describe the main difference between Rutherford's and Bohr's atomic models.
Explain why the classical Rutherford model could not explain the stability of atoms.
In Rutherford's gold foil experiment, most alpha particles passed through the foil undeflected. What does this observation suggest about the structure of the atom?
Name the scientist who first suggested that atoms are mostly empty space.
Describe one experimental observation from Rutherford's gold foil experiment that contradicted Thomson's model.
In Rutherford's gold foil experiment, most alpha particles passed through the foil undeflected. What does this observation suggest about the structure of the atom?
Which of the following best describes the main idea of Dalton's atomic theory?
(1) Atoms are made up of protons, neutrons, and electrons.
(2) Atoms are indivisible and indestructible particles.
(3) Atoms have a central nucleus.
(4) Atoms have quantized energy levels.
Which of the following is a limitation of the Bohr model?
(1) It cannot explain the spectra of multi-electron atoms.
(2) It cannot explain the existence of the nucleus.
(3) It cannot explain the existence of electrons.
(4) It cannot explain the mass of the atom.
Which of the following is NOT an assumption of Dalton's atomic theory?
(1) Atoms are indivisible.
(2) Atoms of the same element are identical.
(3) Atoms can be created or destroyed in chemical reactions.
(4) Atoms combine in simple whole-number ratios to form compounds.
Which of the following models first introduced the concept of quantized energy levels for electrons?
(1) Dalton's model
(2) Thomson's model
(3) Rutherford's model
(4) Bohr's model
Fill in the blank: In Bohr's model, the permitted orbits are those in which the electron's angular momentum is an integer multiple of ________.
Fill in the blank: The energy of an electron in the nth orbit of a hydrogen atom is given by En = ________.
The atomic model that described electrons as being embedded in a positively charged 'pudding' was proposed by ________.
The atomic number of an element is equal to the number of ________ in its nucleus.
True or False: According to Bohr's model, electrons radiate energy when they are in stable orbits.
True or False: According to Dalton's atomic theory, atoms of different elements can have the same mass.
True or False: According to Thomson's model, the atom is a sphere of positive charge with electrons embedded in it.
True or False: The Bohr model can accurately predict the spectra of all elements.
