Across
- 3. positively charged particles
- 6. and electrons of that atom; measured in
- 10. number of protons in the nucleus of one atom in an element
- 13. mass of one atom of an element
- 14. when energy is absorbed into, especially during a chemical reaction
- 16. measure of atomic mass; 1 amu is equal to 1/12th the mass of a carbon-12 atom
- 19. which are formed from a nonmetal and a metal which balance out
- 20. the orbit of an electron around the nucleus of an atom
- 22. when energy is given off from, especially from a chemical reaction
- 23. positively charged centre of an atom; contains protons and neutrons
- 26. second most reactive elements, group 2 of the periodic table
- 27. which are formed from two nonmetals
Down
- 1. most reactive non metals
- 2. dull, brittle insulators
- 4. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
- 5. neutral particles
- 7. anything that has mass and occupies space
- 8. group 1 metals in the periodic table, not including hydrogen;the most reactive of the metals
- 9. also known as rusting, is caused when oxygen reacts with a metal
- 11. that are made up for 2 or more substances
- 12. substances that are made up of one type of matter and have a unique set of characteristics
- 15. from the total number of protons,
- 17. atom that has become electrically charged because it has lost or gained electrons; a positive ion is an atom that has lost one or more electrons;a negative ion is an atom that has gained one or more electrons
- 18. least reactive substances
- 21. Molecule
- 24. invisible negatively charged particle that orbits the nucleus of an atom
- 25. shiny, malleable, ductile element that conducts electricity
- 28. The non-metal in the periodic table with the symbol O