Question

Which statement is wrong?

[1] The atomic weight of carbon is about 12.

[2] The most stable ion of lithium is Li+ .

[3] A phosphorus atom is larger than an antimony atom.

[4] The radius of a sodium atom is larger than that of a sodium cation.

[5] Oxygen has a less negative electron affinity than fluorine.

Answer 1

As you move down the columns (groups) of the periodic table, the atomic radius increases because there are more energy levels and therefore more distance between protons and electrons.

Therefore, an antimony atom is larger than a phosphorus atom.

Answer: [3].