Summarize The Salient Features Of Group 2 Elements

Summarize the salient features of Group 2 elements

graph TD; A[Group 2 Elements] --> B[Physical Properties]; A --> C[Chemical Properties]; A --> D[Reactivity]; A --> E[Occurrence]; B --> F[Hardness]; B --> G[Density]; B --> H[Melting and Boiling Points]; C --> I[Reaction with Water]; C --> J[Reaction with Oxygen]; C --> K[Reaction with Halogens]; D --> L[Reactivity with Acids]; D --> M[Reactivity with Bases]; E --> N[Abundance in Earth's Crust]; E --> O[Extraction and Refining];