Considering the periodic trend of metallic character, which group of elements is generally the most reactive metals?

• A. Halogens (Group 17)
• B. Transition metals (Groups 3-12)
• C. Alkali metals (Group 1)
• D. Noble gases (Group 18)

Answer: (C)

Verified step by step guidance

1. Understand that metallic character refers to how readily an element can lose electrons to form positive ions (cations). Metals tend to lose electrons easily, so higher metallic character means higher reactivity for metals.
2. Recall the periodic trend: metallic character increases as you move down a group in the periodic table because atoms have more electron shells, making it easier to lose outer electrons.
3. Also, metallic character increases as you move from right to left across a period because elements on the left have fewer valence electrons and lower effective nuclear charge, making electron loss easier.
4. Identify the groups: Alkali metals (Group 1) are located at the far left and bottom of the periodic table, meaning they have the highest metallic character and are the most reactive metals.
5. Compare with other groups: Halogens (Group 17) are nonmetals and gain electrons, transition metals have moderate metallic character, and noble gases (Group 18) are inert. Therefore, alkali metals are the most reactive metals.