Which statement describes a periodic trend of atomic radius?
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a. it tends to decrease from left to right across a period.
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b. it remains the same within a period.
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c. it remains the same within a group.
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d. it tends to decrease from top to bottom of a group.

A. It tends to decrease from left to right across a period

Explanation: This trend is caused by the increase number of protons in an atoms nucleus when moving across a period. The protons pull the electrons towards the nucleus causing the atomic radii to shrink and gets smaller or also called as electron shielding.

answer: any goods being imported from another country may be subject to issued by the federal government are tariffs

explanation:  

tariffs are a tax on anything that are imported from abroad. government use them to protect and boost their local industries and the thought is that they encourage consumers to buy local instead of importing and they will hope will protect jobs and economy in the country that implements them