Use the periodic table to compare the sizes of ionic radii with the corresponding atomic radii or other ionic radii. choose from smaller and larger in the blanks below

a sodium cation (larger/smaller) than a sodium atom
a phosphorus anion is /smaller) than a phosphorus atom
a magnesium ion /smaller) than a sodium ion
a chlorine ion /smaller) than a phosphorus ion
a potassium ion /smaller) than a sodium ion

1. smaller
2.smaller
3.larger
4.larger
5.smaller
 2. ... its Larger. because The extra electrons add to the volume of the atom. Since they're just filling in levels that are already partially filled, it isn't by much, but they do push on the other electrons by way of their charge, decreasing the density of the 3-minus ion relative to that of the neutral atom.5.Na+ ions are smaller than K+ ions because K+ ions are farther down the periodic table, which causes atomic radius to increase because the strength of the bonds decreases (there are more elementary particles to attract, i.e. electrons, protons, neutrons), and they become more spread out. Also, K+ has more protons than Na+ ions.   so yeah thats how i got my answer ever thou i got number 2 wrong 

Yes you are correct use the scientific method