1. Consider the ground state of the silicon atom (Z = 14). What is the electroni
ID: 2012420 • Letter: 1
Question
1. Consider the ground state of the silicon atom(Z = 14).
What is the electronic configuration for this
state?
1. 1s2 2s2 2p6 3s1 3p3
2. 1s2 2s2 2p6 3s2 3p2
3. 1s3 2s3 3p2 3s3 3p3
4. 1s2 2s2 2p6 3s3 3p1
Why do atoms that have the same number of
electron shells decrease in size with increasing
atomic number?
1. Elements with great atomic numbers usu-
ally don’t react chemically with other ele-
ments.
2. The electron shells are pulled in more
tightly because of the larger number of pro-
tons in the nucleus.
3. Atoms decrease in size with increasing
atomic number in order to release energy.
4. The greater the atomic number, the fewer
electrons the atom can have.
Explanation / Answer
the electron configuration for Si is 1s2 2s2 2p6 3s2 3p2 The more electrons they have, the more protons they have. So the electric force between the positive protons and the negative electrons (all on the same shell) increase, and the shell gets closer to the nucleus. #2 if just want answer.
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