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How many valence electrons are present in a neutral atom of strontium (Sr)?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons are present in a single atom of carbon?
A
4
B
6
C
2
D
8
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Identify the atomic number of carbon, which is 6. This means a carbon atom has 6 electrons in total.
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom that participate in chemical bonding.
Determine the electron configuration of carbon. The first shell (1s) holds 2 electrons, and the second shell (2s and 2p) holds the remaining electrons.
Write the electron configuration for carbon: \$1s^2 2s^2 2p^2$.
Count the electrons in the outermost shell (the second shell): \$2s^2$ and \$2p^2$ add up to 4 valence electrons.
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