Multiple Choice
How many valence electrons does a hydrogen atom have?
10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons are present in a neutral atom of neon?
A
8
B
10
C
2
D
6
Verified step by step guidance1
Identify the element in question, which is neon (Ne). Neon is a noble gas with atomic number 10.
Recall that the atomic number represents the total number of electrons in a neutral atom. Therefore, neon has 10 electrons.
Determine the electron configuration of neon to find how these electrons are distributed among the shells. The electron configuration of neon is $1s^2 2s^2 2p^6$.
Recognize that valence electrons are the electrons in the outermost shell. For neon, the outermost shell is the second shell, which contains the $2s^2$ and $2p^6$ electrons.
Add the electrons in the outermost shell: $2$ (from $2s^2$) plus $6$ (from $2p^6$), giving a total of $8$ valence electrons.
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