Chemistry — Group 1 Reactivity

digraph Group1 {
  rankdir=LR;
  node [shape=box, style=rounded];
  "Alkali metal + water" -> "Metal hydroxide + hydrogen";
  "Down the group" -> "More reactive";
  Lithium -> "Fizzes gently";
  Sodium -> "Melts and moves";
  Potassium -> "Ignites (lilac flame)";
}