Across
- 3. elements with similar reactivity
- 4. arrangement of elements with same number of shells around their nucleus
- 7. shortest period
- 8. number of shells of ions of chlorine and potassium are similar to it
- 9. a noble gas which shows some reactions
- 11. an element with last two or three partially filled shells
- 12. arranged elements in periods and columns
- 14. coinage metals
- 17. least reactive alkali metal
- 19. colourless, odourless, highly flammable gas with atomic number 1
- 20. mutual sharing of an electron pair between two atoms
- 22. determines the group number
- 25. they have same number of protons but different mass numbers
- 27. last element in the periodic table
- 29. any substance which cannot be decomposed into simpler substances
Down
- 1. Most reactive halogen
- 2. a noble metal
- 5. total number of families in the periodic table
- 6. doeesnot occur in earth's atmosphere
- 10. electrostatic attractions between oppositely charged particles
- 13. third element in carbon family
- 15. has 5 electrons in the 3rd shell
- 16. donot contain normal elements
- 18. most reactive non metals
- 21. a neutral subatomic particle of an atom
- 23. metals of group II-A
- 24. name given to group 6 A elements
- 26. can gain one electron with highest difficulty to form negative ion as compared to other members of its group
- 28. abbreviations used in chemistry for chemical elements