# Lauren

Which has the larger radius N^3- or P^3-?

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1. See my your previous question and my response.

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2. so in my book there is a chart but there is not a number for it so I can see which has a larger radius what is another way to tell which is larger they both have a 3- charge

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3. Look at the placement of N and P on the periodic chart. The electron configuration of N is
7N = 1s2 2s2 2p3 =7 electrons
P is
15P = 1s2 2s2 2p6 3s2 3p3 = 15 electrons.
You know that neutral P is larger than neutral N
a) because size generally decreases as you down the table--why?
b)because we are adding extra shells. Look at N and P. N has nothing in the 3rd shell but P has 5 electrons in the 3rd shell.
SO, if neutral N is smaller than neutral P, then it must follow that N3- must be smaller than P3-? right?

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4. correct thank you for the help

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