Quantum Numbers and Electron Configuration

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

• 1
• 2
• 3
• 4

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

• 1
• 2
• 3
• 5

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 total number of orbitals that can exist at the second main energy level is

• 2
• 3
• 4
• 8

What is the electron configuration for nitrogen?

• 1s² 2s² 2p³
• 1s² 2s³ 2p²
• 1s² 2s³ 2p¹
• 1s² 2s² 2p² 3s¹

The distance traveled between two successive peaks of a waves is the

• speed
• frequency
• wavelength
• energy

According to the Bohr model of the atom, the single electron of a hydrogen atom circles the nucleus

• in specific, allowed orbits.
• in one fixed orbit at all times.
• at any of an infinite number of distances, depending on its energy.
• counterclockwise.

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.

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

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