1) Be, Ca, N - identify the atoms with the largest and smallest radius

Of the three elements (highlighted in blue), Ca is closest to the bottom left of the periodic table, so it will have the largest radius. N is closest to the upper right, so it will have the smallest radius.

2) Be, Ca, N - identify the atoms with the largest and smallest electron affinity

The trend for electron affinity is opposite to that for radius, so the largest electron affinity will be in the element nearest the upper right, N, and the smallest will be the element closest to the lower left, Ca.

3) Ge, O, P - identify the atoms with the largest and smallest electronegativity

(Highlighted in green) The largest electronegativity will be found in the element closest to the upper right, which will be O. The smallest electronegativity will be found in the element closest to the lower left, which will be Ge.

4) Ge, O, P - identify the atoms with the largest and smallest ionization energy

The trends in ionization energy will be the same as electronegativity, so O should have the largest and Ge should have the smallest electronegativity.

5) F, K, Se - identify the atoms with the smallest and largest electronegativity

(Highlighted in red) Smallest electronegativity : lower left (K), largest electronegativity : upper right (F).

6) F, K, Se - identify the smallest and largest atoms

7) C, Na, Si - identify the atoms with the smallest and largest ionization energy

(Highlighted in purple) Smallest IE : lower left (Na), largest IE : upper right (C).

8) C, Na, Si - identify the atoms with the smallest and largest electron affinity

**Note : you can't always rank elements just by visual inspection of the periodic table**

9) Br, Cl, S - identify the largest and smallest atoms

(Highlighted in black) Between these three, it is clear that Cl is closest to the upper right, so it will be the smallest atom. Br is below Cl, so it will be larger than Cl. S is to the left of Cl, so it will also be larger than Cl. But which element is closest to the lower left, Br or S? This is a case where you can't tell, so we cannot rank these two atoms. Our best guess is that Br and S are both larger than Cl, but of similar size.

10) Br, Cl, S - identify the atoms with the largest and smallest electronegativity

Again, Cl will have the largest electronegativity, since it is closest to the upper right. But we can only predict that the electronegativities of Br and S are similar, and we cannot rank them.

	Created by Hannah Jordan almost 8 years ago

Science (Chemistry) Slide Set on Chemistry Practice Problems, created by Hannah Jordan on 02/02/2017.