Problem: Rank the following elements in order of decreasing atomic radius. Rank from largest to smallest radius. To rank items as equivalent, overlap them.a) Rb, Na, K, Lib) Li, Be, B, N

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We’re being asked to rank the given set of elements in order of decreasing atomic radius.


Atomic radius represents the distance from the nucleus to the outer shell of an element. 

Trend of the atomic radius in the periodic table:

decreases going from left to right of a period

increases going down a group

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Problem Details

Rank the following elements in order of decreasing atomic radius. Rank from largest to smallest radius. To rank items as equivalent, overlap them.

a) Rb, Na, K, Li

b) Li, Be, B, N

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Periodic Trends: Atomic Radius concept. You can view video lessons to learn Periodic Trends: Atomic Radius. Or if you need more Periodic Trends: Atomic Radius practice, you can also practice Periodic Trends: Atomic Radius practice problems.

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Based on our data, we think this problem is relevant for Professor DiMauro's class at MT SAC.