Name __________________________________________ Date ______________________ Period _________
Circle the correct response.
1. True or False. The quantum mechanical model of the atom estimates the probability of finding an electron in a certain position.
2. In the quantum mechanical model the regions where electrons are likely to be found are called (atomic orbitals, atomic structures) and are denoted by (letters, numbers).
3. The ways in which electrons are arranged around the nuclei of atoms are called (electron arrangement, electron configurations).
Match the name of the rule used to find the electron configurations of atoms with the rule itself
4. ____ Aufbau Principle a. When electrons occupy orbitals of equal energy, one electron enters each orbital until all the orbitals contain one electron with parallel
5. ____ Pauli Exclusion Principle
6. ____ Hund’s Rule spins. b. Electrons enter orbitals of lowest energy first. c. An atomic orbital may contain at most two electrons.
Fill in the electron configurations for the elements given in the table.
Element Orbital Filling Electron Configuration shorthand
7. C
8. B
9. F
1s
2s 2p
3s 3p
1s
2s 2p
3s 3p
1s
2s 2p
3s 3p
Introduction to Chemistry

Element
10. Ne
11. N
Orbital Filling
1s
2s 2p
3s 3p
1s
2s 2p
3s 3p
Electron Configuration shorthand
Electron Configuration Shorthand
1s 2 2s 2 2p 6 3s 2 3p 4
1s 2 ,2s 2 ,2p 6 ,3s 2 ,3p 6 ,4s 2 ,3d 10 ,4p 1
1s 2 2s 2 ,2p 6 , 3s 2 , 3p 6 , 4s 2 , 3d 10 , 4p 6 , 5s 1
Name of Element
12. In the shorthand method for writing an electron configuration, what does the superscript stand for? 1s 2
The number of (electrons, protons, neutrons) occupying a given (sublevel, subshell)
13. In the shorthand method for writing an electron configuration, what does the sum of the superscripts equal?
1s 2 , 2s 2 , 2p 4 = 2 + 2 + 4 = 8
The sum equals the number of ____________________ in the atom
Te
In
Ge
14. Filled energy subshells are more (stable, unstable) than partially filled subshells.
15. Half-filled levels are not as stable as (filled, unfilled) levels, but are more stable than other configurations.
Element Name Valence Electrons Electrons Per Energy Level (Not the Bohr Model- Use
your chart)
6 2,8,18,18,6
Introduction to Chemistry