When moving down a group in the Modern Periodic Table, what happens to the number of valence electrons?
Remains the same
When moving down a group in the Modern Periodic Table, the number of valence electrons remains the same for all elements in that group.
Increasing by two, decreasing by one, or increasing by one describe changes that do not occur when moving down a group.
Hence, 'Remains the same' is the correct answer.
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