Which of the following elements is an alkali metal?

Rationale

Rubidium is an alkali metal.

Alkali metals are found in Group 1 of the periodic table and are characterized by having a single electron in their outermost shell. Rubidium, with atomic number 37, fits this criterion, making it an alkali metal.

A (magnesium) YOUR ANSWER

Magnesium is located in Group 2 of the periodic table and is classified as an alkaline earth metal rather than an alkali metal. It has two electrons in its outer shell, which distinguishes it from alkali metals that only have one.

B (rubidium) CORRECT

Rubidium is indeed an alkali metal, belonging to Group 1 of the periodic table. It has one electron in its outermost shell, which gives it the characteristic properties of alkali metals, such as high reactivity, especially with water.

C (hydrogen) YOUR ANSWER

Although hydrogen is located in Group 1, it is not classified as an alkali metal due to its distinct properties and lack of metallic character. Hydrogen exists as a nonmetal and primarily forms covalent bonds, differing significantly from the metallic behavior of alkali metals.

D (chlorine) YOUR ANSWER

Chlorine is a halogen found in Group 17 of the periodic table, not an alkali metal. It has seven electrons in its outer shell and is known for its reactivity as a nonmetal, particularly in forming ionic bonds with metals.

Conclusion

Alkali metals are specifically defined by their position in Group 1 of the periodic table, characterized by having one electron in their outermost shell. Rubidium is the only element among the choices listed that aligns with this definition, while magnesium, hydrogen, and chlorine represent different groups with distinct properties. This classification is essential for understanding the chemical behavior and reactivity of the elements.

Which of the following elements is an alkali metal?

Rubidium is an alkali metal.

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