Multiple Choice
How many valence electrons does a fluorine atom have?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons does a neutral rubidium (Rb) atom have?
A
2
B
1
C
7
D
5
Verified step by step guidance1
Identify the element in question, which is rubidium (Rb).
Determine the atomic number of rubidium, which tells you the total number of electrons in a neutral atom. Rubidium has an atomic number of 37.
Recall that valence electrons are the electrons in the outermost shell (highest principal energy level) of an atom.
Write the electron configuration of rubidium to find the outermost shell electrons. The electron configuration is $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6 5s^1$.
From the electron configuration, identify the valence electrons as those in the 5s orbital, which is 1 electron for rubidium.
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