Multiple Choice
Which element has 5 valence electrons in the third energy level?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Which of the following best describes the outermost energy level of a hydrogen atom?
A
It has one electron in the first energy level (n = 1).
B
It has no electrons in its outermost energy level.
C
It has eight electrons in the third energy level (n = 3).
D
It has two electrons in the second energy level (n = 2).
Verified step by step guidance1
Recall that the hydrogen atom has only one electron in total.
Understand that the energy levels (or shells) are labeled by the principal quantum number \( n \), starting from \( n = 1 \) for the closest shell to the nucleus.
Since hydrogen has only one electron, it will occupy the lowest energy level available, which is \( n = 1 \).
The first energy level (\( n = 1 \)) can hold up to 2 electrons, but hydrogen has only one electron, so its outermost energy level contains exactly one electron.
Therefore, the best description of the outermost energy level of a hydrogen atom is that it has one electron in the first energy level (\( n = 1 \)).
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