Which of the Following Is True About Elements in the Same

Which of the following is true about elements in the same horizontal row of the periodic table?

A) The number of valence electrons remains the same throughout the row.
B) The number of valence electrons decreases as we move left to right across a row.
C) The number of valence electrons increases as we move left to right across a row.
D) There is no simple relationship between the number of valence electrons and the position of the element.

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