Across
- 3. being reactive
- 6. able to be hammered or pressed into shape without breaking or cracking
- 9. six chemical elements in group 2 of the periodic table
- 11. an element that when it reacts with metal it produces a wide range of salts
- 15. process by which an unstable atomic nucleus loses energy
- 16. consist of two protons and two neutrons bound together into a particle identical to a helium-4 nucleus
- 23. Particle / a fast-moving electron emitted by radioactive decay of substances
- 24. molecules composed of only two atoms
- 25. one of the four fundamental states of matter, beside solid, liquid and gas
- 26. penetrating electromagnetic radiation arising from the the radioactive decay of atomic nuclei
- 28. any of the set of metallic elements occupying a central block in the periodic table, e.g. iron
- 30. the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass
- 31. has no charge
- 33. emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei
- 37. damage caused to metal, stone, or other materials by corrosion
- 38. the interval of time between successive occurrences
Down
- 1. an element or substance that is not a metal.
- 2. a solid material which is typically hard
- 4. a comparative level of capacity for vigorous activity
- 5. gives out negative charge
- 7. any of the gaseous elements helium, neon, argon, krypton, xenon, and radon, occupying Group 0 (18) of the periodic table
- 8. machine that uses electromagnetic fields to propel charged particles to very high speeds and energies
- 10. a nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy
- 12. any of the elements lithium, sodium, potassium, rubidium, caesium, and francium, occupying Group IA (1) of the periodic table
- 13. has a positive charge
- 14. the total number of protons and neutrons in a nucleus
- 17. the number of protons in the nucleus of an atom
- 18. abbreviation for a chemical element
- 19. an element whose properties are intermediate between those of metals and solid non-metals
- 20. a table of the chemical elements arranged in order of atomic number
- 21. the degree to which a specified material conducts electricity
- 22. the mass of an atom of a chemical element
- 27. able to be deformed without losing toughness
- 29. solid substance that has a conductivity
- 32. a number of things
- 34. a substance introduced into a biological organism or other system so that its subsequent distribution may be readily followed from its colour, radioactivity, or other distinctive property
- 35. each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei
- 36. the smallest particle of a chemical element that can exist