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How many valence electrons does thallium (Tl) have?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Which of the following elements has 7 valence electrons?
A
Chlorine (Cl)
B
Sodium (Na)
C
Oxygen (O)
D
Carbon (C)
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Recall that the number of valence electrons corresponds to the electrons in the outermost shell of an atom, which determines its chemical properties.
Identify the group number of each element in the periodic table, as elements in the same group have the same number of valence electrons.
Sodium (Na) is in Group 1, so it has 1 valence electron.
Oxygen (O) is in Group 16, so it has 6 valence electrons.
Chlorine (Cl) is in Group 17, so it has 7 valence electrons, which matches the question's requirement.
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