Quantum Theory

How many quantum numbers are needed to describe the energy state of an electron in an atom?

• 1
• 2
• 3
• 4

How many electrons can the first energy level hold?

• 1
• 2
• 8
• 0

The angular momentum quantum number indicates the

• orientation an orbital around the nucleus.
• shape of an orbital.
• direction of the spin of the electron in its orbital.
• main energy level of an orbital.

The set of orbitals that are dumbbell shaped and directed along the x, y, and z axes are called 

• d orbitals.
• p orbitals.
• f orbitals.
• s orbitals

How many orientations can an d orbital have about the nucleus?

• 1
• 2
• 3
• 5

A line spectrum is produced when an electron moves from one energy level

• into the nucleus.
• to another position in the same sublevel.
• to a higher energy level.
• to a lower energy level.

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If electrons in an atom have the lowest possible energies, the atom is in the

• ground state.
• inert state.
• excited state.
• radiation-emitting state.

An orbital that can never exist according to the quantum description of the atom is

• 6d.
• 3f.
• 3d.
• 8s.

Atoms are made up of three basic parts, which are -

• Protons, neutrons, electrons
• neutrinos, protons, neutrons
• quarks, protons, electrons
• electrons, neutrons, and quarks

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Who proposed that the electrons could also have wavelike behaviors.

• Bohr

• Heisenberg

• de Broglie

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