Identify the number of core electrons for O.
A) 0
B) 1
C) 2
D) 3
E) 4

Name: Identify the number of core electrons for O. A) 0 B) 1 C) 2 D) 3 E) 4
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Question

Quizplus · Accepted Answer

Oxygen has 8 electrons, and its atomic number is 8. Therefore, it has 8 protons, and in the neutral state, it also has 8 electrons. Oxygen's electron configuration is 1s2 2s2 2p4. The 2s2 and 2p4 electrons are valence electrons, so the remaining 2 electrons in the 1s orbital are core electrons. Thus, the number of core electrons for O is 2.

Identify the Number of Core Electrons for O