Electrons in Atoms

Which element is represented by the electron configuration 1s²2s²2p²?

• Be

• He

• C

• O

• none of these

The product of the frequency and the wavelength of a wave equals the

• number of waves passing a point in a second

• speed of the wave

• distance between wave crests

• time for one full wave to pass

The frequency of electromagnetic is measured in waves per second or

• nanometers

• quanta

• hertz

• joules

The distance between two successive peaks on adjacent waves is its

• frequency

• wavelength

• quantum number

• velocity

For electromagnetic radiation, c (the speed of light) equals

• frequency minus wavelength

• frequency plus wavelength

• frequency divided by wavelength

• frequency times wavelength

According to the quantum theory of an atom, in an orbital

• an electron's position cannot be known precisely

• an electron has no energy

• electrons cannot be found

• electrons travel around the nucleus on paths of specific radii

A three-dimensional region around a nucleus where an electron may be found is called a(n)

• spectral line

• electron path

• orbital

• orbit

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

• 1

• 2

• 3

• 4

The letter designations for the first four sublevels with the maximum number of electrons that can be accommodated in each sublevel are

• s:2, p:4, d:6, f:8

• s:1, p:3, d:5, f:7

• s:2, p:6, d:10, f:14

• s:1, p:2, d:3, f:4

The spin quantum number (m_s) indicates that the number of possible spin states for an electron in an orbital is

• 1

• 2

• 3

• 5