Multiple Choice
How many valence electrons does a neutral cobalt (Co) atom have?
2
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons does an atom of neon (Ne) have?
A
6
B
8
C
4
D
2
Verified step by step guidance1
Identify the element in question, which is neon (Ne). Neon is a noble gas located in Group 18 of the periodic table.
Recall that the number of valence electrons corresponds to the electrons in the outermost shell of an atom.
For elements in Group 18, the valence shell is completely filled with 8 electrons, except for helium which has 2.
Since neon is in the second period, its valence shell is the second energy level, which can hold up to 8 electrons.
Therefore, neon has 8 valence electrons because its outermost shell is fully occupied.
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