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Which of the following represents the valence electron configuration for a carbon atom?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence shell electrons does an atom of thallium (Tl) have?
A
3
B
1
C
5
D
2
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Identify the element thallium (Tl) on the periodic table to determine its group and period.
Recall that valence electrons are the electrons in the outermost shell of an atom, which participate in chemical bonding.
Thallium (Tl) is in group 13 of the periodic table, which means it typically has 3 valence electrons in its outermost shell.
However, thallium is a heavier element where the valence shell configuration can be influenced by the filled d and f subshells, often resulting in only 1 electron being chemically active in the outermost shell.
Therefore, the number of valence electrons for thallium is 1, reflecting its common oxidation state and chemical behavior.
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