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Electronegativities change both down a group and across a period. In general these changes are to:

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	Down a group	Across a period from left to right
d	decrease	decrease

	Down a group	Across a period from left to right
c	decrease	increase

	Down a group	Across a period from left to right
a	increase	increase

	Down a group	Across a period from left to right
b	increase	decrease

answer is C.

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Detailed Solution

The ability of an atom to draw shared electrons to itself is measured by its electronegativity. Electronegativity on the periodic table typically rises from left to right across a period and falls as you move down a group.

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