Here are some detailed notes on key topics in chemistry for SSC:

Formed by the complete transfer of electrons from a metal to a non-metal (e.g., NaClcap N a cap C l MgOcap M g cap O

Atoms with the same atomic number but different mass numbers (e.g., Protium, Deuterium, Tritium).

In the exam, if you do not know the exact answer, try eliminating options based on known periodic trends or chemical properties.