Download HW 10: Electron Configuration Practice -

HW 10: Electron Configuration Practice In the space below, write the expanded electron configurations of the following elements:
1)
2)
3)
4)
5)
sodium
potassium
chlorine
bromine
oxygen
In the space below, write the noble gas electron configurations of the following elements:
6)
7)
8)
9)
10)
manganese
silver
nitrogen
sulfur
argon
In the space below, write the orbital notation of the following elements:
11) manganese
12) gallium
13) nitrogen
14) sulfur
15) argon
Determine what neutral elements are denoted by the following electron configurations:
16)
17)
18)
19)
20)
1s22s22p63s23p4
1s22s22p63s23p64s23d104p65s1
[Kr] 5s24d105p3
[Xe] 6s24f145d6
[Rn] 7s25f11
Determine which of the following electron configurations are not valid:
21) 1s22s22p63s23p64s24d104p5
22) 1s22s22p63s33d5
23) [Ra] 7s25f8
24) [Kr] 5s24d105p5
25) [Xe]
Atomic Structure
Atomic Structure and Nuclear Chemistry
Look
Look at this electron configuration of an atom.
1s2 2s2 3p6 3s2 3p6 4s1
or [Ar] 4s1
Think
Think about the arrangement of electrons and which atom this configuration would represent.
In quantum mechanics, the electron configuration is the arrangement of electrons around the
nucleus of the atom. An electron configuration provides information about the number of electrons
in each orbital. The letters in the electron configuration correspond to the different orbitals present.
The lowest orbital is labeled as an s, and it can hold up to two electrons. The p orbital can hold up
to six electrons, and a d orbital can hold up to ten electrons. An f orbital can hold up to 14
electrons. The small numbers found in the electron configuration corresponds to the number of
electrons found in that orbital. The large number corresponds to the energy levels. A way to check
that an electron configuration is correct is to add up all the small numbers. The sum of these
numbers should equal to the number of electrons the atom carries. As the atoms increase in mass,
they also increase in number of electrons. When the electron configuration for these atoms
become very long, a shortcut is used known as the Noble Gas notation. The noble gas found
before the atom in question is written in brackets, followed by the electron notation required to
represent the remainder of the atoms electrons.
Write
Using the above electron configuration, express which atom is being represented. Include the
number of electrons in each orbital along with the total number of electrons for the atom. Explain
the technique used to check to see if the electron configuration is correct for the atom represented.
Be sure to –
•  Address the prompt, provide support, and conclude your thoughts.
•  Write legibly and concisely.
1