Name_________________________
Hour_________________________
Electron Configuration Worksheet
1. Use the periodic table to write the ground state electron configuration for the following:
a. Si ___________________________________________________________________
b. Se ___________________________________________________________________
c. Rb ___________________________________________________________________
d. I _____________________________________________________________________
2. Write the outer shell configuration for the following:
a. nitrogen ________________________
b. phosphorus _________________________
c. oxygen _________________________
d. sulfur ______________________________
e. argon ___________________________
e. xenon ______________________________
The chemical properties of atoms, ions and molecules are related to the arrangement of
the (3) ________________________ within them.
The first modern atomic theory, proposed by (4) __________________, portrayed the
atoms as a solid, indivisible mass. After the discovery of the electron by (5) ________________,
the atomic model was revised to include them. Rutherford pictured the atom having a dense
(6)____________________ surrounded by electrons. In the Bohr model, the electrons move in
set (7) ______________________. The (8) _____________________ model is the modern
description of the electrons in atoms. This model estimates the (9) ________________________
of finding an electron within a certain volume of space surrounding the nucleus.
True or False
_____ 10. The number of sublevels in an energy level is equal to the square of the principle
quantum number of that energy level.
_____ 11. The maximum number of electrons that can occupy the fourth principle energy level of
an atom is 32.
_____ 12. The principle quantum number equals the number of sublevels within that principle
energy level.
_____ 13. The position and velocity of an electron in an atom can be determined with great
certainty.
_____ 14. The photoelectric effect will occur no matter what frequency of light strikes a metal.
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The ways in which electrons are arranged around the nuclei of atoms are called
(15)____________________________________. The (16) ___________________________
describes the sequence in which orbitals are filled. The various orbitals within a sublevel of a
principle energy level are always of (17) _____________ energy. The (18) ______________
_____________________________ principle states that a maximum of only (19) __________
electrons can occupy each orbital. To occupy the same orbital two electrons must have
(20)_______________ spins. Hund’s rule states that the electrons pair up only after each orbital
in a sublevel is occupied by (21) ________________________. For showing the electron
configuration of an atom, (22) ___________________ are used to indicate the number of
(23)________________ occupying each sublevel.
According to quantum mechanics, the motions of subatomic particles may be described
as (24) ______________________. Every element emits (25) _________________________ if
it is heated by passing an electric discharge through its gas or vapor.
26. How many s orbitals are there in each principal energy level? ________________________
27. How many orbitals are there in the n=4 principal energy level? _______________________
28. How many electrons can the n=4 principal energy level hold maximum? ________________
29. How many orbitals are in each of the following: 4p sublevel _______; 3d sublevel________;
4f sublevel _______; 2s sublevel ________
30. Which is the lowest atomic number element with a full third energy level? _______________
31. Which is the lowest atomic number element that contains a p electron? __________________
32. How many sublevels are in the following principal energy levels? n=1_______; n=2_______;
n=3_______; n=4 _________.
33. Write an electron configuration for the following:
a. barium ______________________________________________________________________
b. krypton _____________________________________________________________________
c. bromine _____________________________________________________________________
d. tellurium ____________________________________________________________________
34. Give the number of protons, neutrons, and electrons in each of the following:
a. 21Na ___________________________________ b. 81Br_____________________________
c. 235U____________________________________ d. 41Ca_____________________________
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