Question

1. which groups are the most reactive, and which are the least reactive?
2. which physical properties do metals, like aluminum or copper have?

Explanation:

For question 6: Reactivity of periodic table groups depends on valence electron stability. Group 1 (alkali metals) has 1 valence electron, easy to lose, making them highly reactive. Group 17 (halogens) has 7 valence electrons, easy to gain 1, also highly reactive. Group 18 (noble gases) has full valence shells, so they are stable and unreactive.
For question 7: Metals like aluminum and copper share characteristic physical properties tied to their metallic bonding, which allows for free-moving electrons and structured atomic arrangements.

Answer:

1. The most reactive groups are Group 1 (alkali metals) and Group 17 (halogens); the least reactive group is Group 18 (noble gases).
2. Metals like aluminum and copper have physical properties including: high thermal and electrical conductivity, malleability (can be hammered into sheets), ductility (can be drawn into wires), a shiny metallic luster, and generally high melting/boiling points.