Across
- 1. Tiny air sacs in lungs for gas exchange
- 4. Gradual destruction of metals due to reactions with environment
- 6. Force acting per unit area
- 7. Electrons in the outermost shell of an atom
- 8. Movement of particles from high to low concentration
- 9. Sum of protons and neutrons in the nucleus
- 10. Number of protons in the nucleus
- 12. Vertical column in the periodic table
- 14. Speed in a given direction
- 15. Substance used to show acidity or alkalinity
- 17. Mixture of metals or metal with another element
- 18. Temperature at which a liquid turns into solid
- 19. Reaction between an acid and a base to form salt and water
Down
- 1. Rate of change of velocity
- 2. Ability of a metal to be hammered into sheets
- 3. Energy stored due to position or condition
- 5. Ability of a metal to be drawn into wires
- 11. Temperature at which a solid turns into liquid
- 13. Horizontal row in the periodic table
- 16. Energy due to motion