Justify Property Predictions Practice Test

Potassium reacts more because its density is higher than sodium’s, and higher density metals always react faster with water.

Potassium reacts more because it has more protons, so it holds its valence electron more tightly and releases more energy when reacting with water.

Potassium reacts more because it is in a higher period, and elements in higher periods always have higher electronegativity, so they attract water more strongly.

Potassium reacts more because it is lower in Group 1, so it has a larger atomic radius and more shielding; its valence electron is easier to remove (lower ionization energy), making it more reactive with water.