Across
- 3. Chemical properties of an element depend on the what in the shells?
- 5. Each vertical column of the periodic table is called?
- 7. The energy change when an electron is added is called?
- 8. Ionic compounds are soluble in?
- 9. What family of elements includes helium and neon?
- 11. The scientist arranged elements by atomic number?
- 13. What are the products formed in this reaction?
- 15. What element has the lowest atomic mass?
- 16. In electron configuration, what does the number before the sub-energy level represent?
Down
- 1. The scientist grouped elements into sets of three known as triads?
- 2. What metals are soft enough to be cut by a knife?
- 4. Tritium and isotopes of hydrogen contains how many neutrons?
- 6. James Chadwick discovered the?
- 10. What transition metal is the best conductor of electricity?
- 12. How many elements are in the second period of the periodic table?
- 14. What is the most common element in the universe?
- 17. The atom which supplies the pair of electrons of bond formation is known as