Properties of the Groups

Question 1

group 1 alkali metals properties

Answer 1

• good conductors of electricity and heat
• low density
• grey shiny surfaces when freshly cut with a knife
• very reactive
• form ionic compounds with non-metals

Question 2

alkali metals reaction with water lithium sodium potassium

Answer 2

lithium

• floats and reacts slowly
• releases hydrogen
• keeps its shape

sodium

• vigorous release of hydrogen
• metal is melted and forms a small ball that moves around on water surface

potassium

• reacts more vigorously
• sufficient heat to ignite hydrogen
• lilac-colored flame
• moves excitedly on water surface

Question 3

group 17 halogens properties

Answer 3

• colored
• gradual change from gases (F and Cl) to liquid (Br) to solid (I and At)
• very reactive non-metals
• form ionic compounds with metals f
• orm covalent compounds with non-metals

Question 4

what do halogens react with group 1 metals to form?

Answer 4

halides