Hundredth.
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The correct punctuation after "thousand" is a comma, not a period. For example, you would write "two thousand, five hundred" not "two thousand. five hundred".
increase from left to right across a period.
The number of valence electrons increases from left to right across a period.
atomic size decreases across a period
On the Periodic Table of elements, electronegativity increases as you move left to right across a period.