26. What do you call specific distances from the nucleus where electrons can be found in Bohr's model? a. atomic orbits b. electron shells c. electron subshells d. atomic shells
27. Which of the following principle states that the more we know about the position of an electron in an
atom, the less we know about its momentum and vice versa?
a Hund's rule
b. Aufbau principle
c. Heisenberg's uncertainty principle d. Paul's exclusion principle
28. How is Rutherford's model deficient as a model compared to Bohr's model?
a Rutherford's model could not account for the stability of atoms.
b. Rutherford's model does not account for spectral lines.
C. Rutherford's model does not explain electron distribution in atoms.
d. Rutherford's model does not take into account wave-particle duality
29. Imagine you are an astronomer. You were given an emission spectroscopy result for a nearby
planet. Which set of elements in the chart are present on the planet?
a. lithium, calcium, strontium
b. cadmium, sodium, strontium
c. lithium, cadmium, sodium
d. calcium, sodium, strontium
30. Which of the following describes the distance of an electron from the nucleus? It is also known as the
principal quantum number.
a. Subshell b. spin c. electron valence shell
d shell
31. Identify the orbital subshell illustrated below.
a s-orbitals
b. p-orbitals
co-orbitals
d. f-orbitals
32. What is the location of an electron with the following set of quantum numbers.
{n = 5, 2 = 3, me = -4, ms= + 3
a 5s orbital with a positive spin b. 5p orbital with a positive spin
c.5d orbital with a positive spin
d. 5f orbital with a positive spin
33. It states that orbitals must be filled singly before being paired.
a. Aufbau principle b. Hund's rule c. Pauli's exclusion principle d. Heisenberg's principle
34. It states that electrons fill up orbitals from the lowest energy level to the highest energy level.
a Aufbau principle b. Hund's rule c. Pauli's exclusion principle d. Heisenberg's principle
35. An orbital containing two electrons must be of opposite spins. What could be a reason why this is the
case?
a Opposite spins have less repulsion between two electrons which minimizes potential energy
b. Opposite spins have more repulsion between two electrons which maximizes potential energy.
c. Opposite spins have some attraction between two electrons which minimizes potential energy
d. Opposite spins have some attraction between two electrons which maximizes potential energy
36. It is a group of elements that is well-known for its chemical inertness and stability
a halogen gases b. noble gases c. lanthanide gases d. actinide gases
37. In the formation of ions, what particle is removed or added in an atom?
a electron
b. positron c. proton
d. neutron
38. Which among the following Lewis electron dot symbols is correct for carbon?
b. C. C.:C:
d.: C
a