Honors Chemistry

Chapter 7 Study Questions


1.Calculate the wavelength in nanometers of an X-ray with a frequency of 7.5 x 1011 MHz.


2.Energy is emitted when a hydrogen electron goes from n = 3 to n = 2.

††††† a)Calculate the energy emitted. (Use the equation, E(n) = -R/n2, where R = 2.178 x 10-18 J.)

††††† b)Calculate the wavelength of light emitted.


3.What was the revolutionary new idea in Bohr's model of the hydrogen atom?What was the most significant difference between the quantum mechanical atom and the Bohr hydrogen atom?Briefly explain the relationship between electron energy levels and atomic spectra.


4.Explain, in terms of their electron configurations, why the most reactive metals are in Group 1, the most reactive nonmetals are in Group 17, and the noble gases are chemically inert.


5.What is the electron capacity of

††††† a)any Principal energy level?††† †††† b)each sublevel?††† †††† c)each orbital?


6.Which of the following sublevels do not exist?List the ones that do exist in order of increasing energy.

††††† a)1s††††††††† ††† b)2s††††† †††† c)2d††††† †††††††† d)3d††††† †††††††† e)4p†††† ††††††††† f)4f


7.What is the maximum number of electrons in an atom that can have these quantum numbers:

††††† a)n = 2, l = 1, ml = 0††††††† b)n = 1, l = 0††††††††††† ††††††††††† c)n = 3, l = 2, ml = 1, ms = +Ĺ


8.Which sublevel is in the process of being filled in the following regions of the periodic table?

††††† a)Groups 1 and 2†††††††††††††††††††††††† b)Transition metals

††††† c)Group 15†††††††††††††††††††††††† †††††††† ††††††††††† d)Inner transitional metals


9.Classify each of the following electron configurations as ground state, excited state or impossible:

††††† a) 1s22s22p1†††††††††† b) 1s21p62s2†††††††††††††††† c) 1s22s22p43s1 ††††††††††† d)1s22s22p63d1


10.Give the complete ground state electron configuration of

††††† a)sulfur†††††††††††††††† b)the element with atomic number 27c)strontium


11.Give the symbol of the element which (in the ground state)

††††† a)has the outer electron configuration 6s2

††††† b)is in Group 18 but has no p electrons

††††† c)has three unpaired 4p electrons

††††† d)has four valence electrons in the Second Principal Energy level.

††††† e)is in Period 3 and has the same outer electron configuration as F.

††††† f)has only five 3d electrons.


12.For the element americium, atomic number 95

††††† a)Give the abbreviated ground state electron configuration

††††† b)Give a set of four possible quantum numbers for its highest energy ground state electron.


13.Sketch the shape of s and p orbitals.How do orbitals change as n increases?


14.Draw a complete orbital diagram for

††††† a)oxygen††††††††††††††††††††††††††††††††††††††††††††††††† b) titanium


15.a)Which element has a greater first ionization energy?Cl or Ar?Na or K?

††††† b)Which element has a larger atomic radius?Mg or Ca?S or Cl?







Summary of Chapter 7:Atomic Structure & Periodicity


wavelength (l), frequency (n)

atomic spectra

Bohr model of the hydrogen atom

ground state, excited states

quantum theory

electron clouds


principle energy levels (n)

sublevels (s, p, d, f):electron capacity and relative energies

possible values for 4 quantum numbers (n, l, ml, ms)

ground state electron configuration of atoms

abbreviated electron configurations

valence electrons

orbital diagrams

Hundís rule

Pauli exclusion principle

atomic radius

ionization energy

electron configuration & the Periodic Table


how to use the following equations:

†††† ln= c

†††† DE=hn

†††† E(n)=-R/n2

where c = 2.9979 x 108 m/s, h = 6.626 x 10-34 Js, R = 2.178 x 10-18 J