Multiple Choice
In the simplified valence-electron model for main-group elements, how many valence electrons does a calcium (Ca) atom have?
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9. Electrons in Atoms and the Periodic Table
Valence Electrons of Elements (Simplified)
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An atom of chlorine has several valence electrons in its ______.
A
second energy level only (n = 2)
B
nucleus
C
innermost electron shell (first energy level, n = 1)
D
outermost electron shell (third energy level, n = 3)
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