Question

A chemist is examining an unidentified element sample with oxidation states of +1 and +2. The element has a shielding effect similar to that of potassium (K). Which statement about the unidentified element is most likely true?

A) The element is a noble gas.
B) The element is a transition metal.
C) The element is an alkali metal.
D) The element is a halogen.

Answer 1

The element with oxidation states of +1 and +2 and a shielding effect similar to that of potassium (K) is most likely an alkali metal.

Step-by-step explanation:

The element with oxidation states of +1 and +2 and a shielding effect similar to that of potassium (K) is most likely an alkali metal, so the correct answer is C) The element is an alkali metal.

Alkali metals, such as potassium, have one electron in their outermost energy level, making it easier for them to lose that electron and form cations with a positive charge. This is consistent with the oxidation states mentioned in the question. Alkali metals are known for their reactivity, softness, and low density.

Noble gases, transition metals, and halogens do not have the same characteristics as alkali metals, so options A, B, and D are not correct.