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Q1. What is the principal quantum number for the outermost electrons in a potassium atom?
A . 1
B . 2
C . 3
D . 4
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Solution:
Potassium (K) has an atomic number of 19, and its outermost electrons are in the n=4 level.
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Q2. What is the electron configuration of a neutral oxygen atom?
A . 1s2 2s2 2p4
B . 1s2 2s2 2p6
C . 1s2 2s2 2p3
D . 1s2 2s2 2p5
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Solution:
Oxygen has 8 electrons, and its electron configuration is 1s2 2s2 2p4.
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