Across
- 2. States that atoms lose, gain or share electrons in order to acquire a full set of eight valence electrons
- 4. the regions of space in which electrons can move about the nucleus of an atom
- 7. basic unit of matter
- 8. A process by which an electric current breaks chemical bonds.
- 10. A group of atoms bonded together
- 11. Atoms of the same element that have different numbers of neutrons
- 17. A chemical bond that involves sharing a pair of electrons between atoms in a molecule
- 18. when two molecules of the same substances are attracted to one another
- 21. subatomic particle with a positive charge
- 23. when two molecules of different substances are attracted to one another
- 25. the number of protons in the nucleus of an atom of an element
- 26. a substance (such as water) that has the ability to dissolve many other substances
- 28. A liquid substance capable of dissolving other substances
- 29. attraction between a partially positive hydrogen atom of a water molecule and a partially negative oxygen atom of another water molecule
- 30. Water's tendency to form an elastic-like sheet or skin
Down
- 1. The electrons in the outermost shell (main energy level) of an atom; these are the electrons involved in forming bonds.
- 3. A covalent bond in which electrons are not shared equally
- 5. A horizontal row of elements in the periodic table
- 6. a covalent bond in which the electrons are shared equally by the two atoms
- 9. A subatomic particle that has a negative charge
- 12. A substance that is dissolved in a solution.
- 13. a vertical column of elements in the periodic table
- 14. Formed when one or more electrons are transferred from one atom to another
- 15. anything that has a mass and takes up space
- 16. The amount of energy required to remove an electron from an atom
- 19. a pure substance made of only one kind of atom
- 20. A positively charged ion
- 22. A subatomic particle that has no charge and that is found in the nucleus of an atom
- 24. A negatively charged ion
- 27. the number of protons and neutrons found in a single atom of a given element