Question

1. to which group does copper belong?

alkaline earth metal
transition metal
metalloid
alkali metal

Explanation:

Copper (\(Cu\)) is a chemical element. Alkali - earth metals are in Group 2 of the periodic table (e.g., \(Mg\), \(Ca\)). Metalloids have properties intermediate between metals and non - metals (e.g., \(Si\), \(Ge\)). Alkali metals are in Group 1 (e.g., \(Na\), \(K\)). Transition metals are in the d - block of the periodic table. Copper (\(Cu\)) has the electron configuration \([Ar]3d^{10}4s^{1}\) and is located in the d - block. By referring to the periodic table's structure and the properties of each group:

• Alkali - earth metals (\(Be\), \(Mg\), \(Ca\), etc.) have specific reactivity and electron - filling patterns that do not match copper.
• Metalloids are in a specific diagonal region (e.g., \(B - Si - Ge - As - Sb - Te\)) and have different physical and chemical properties than copper.
• Alkali metals (\(Li\), \(Na\), \(K\), etc.) have one valence electron in an s - orbital and very high reactivity, which is not characteristic of copper.
• Transition metals have partially filled d - orbitals. Copper, with its electron configuration involving the d - orbital (\(3d\) in this case), fits the transition - metal category.

Answer:

transition metal