Across
- 1. a puresubstance made of only one kind of atom
- 9. in an atom when it has more electrons then protons
- 13. particles with no charge(nutral)located in the nucleus of an atom
- 14. a chemical bond formed when atoms share one pair of electrons
- 15. the smallest particle of a compound that retains all the properties of the compound and is composed of one or more atoms
- 16. negitivly charged particles located outside the nucleus of an atom
- 19. uses dots to repersent valence electrons around an element's atomic symbol
- 20. the average mass of all the isotopes of an element
- 22. electrons on the outermost energy level of an atom
Down
- 2. a table that shows the elements,the atomic number,symbol,and average atomic mass;elements with similar chemical propertiesare grouped to gether
- 3. a chemical bond formed when atoms share two paresof electrons
- 4. the central part of an atom where protons and nutrons are located
- 5. a chemical bound resulting from the attraction between oppositely charged ions
- 6. achemical bond formed when atoms share electrons
- 7. a charge atom due to the lost or gain negitive electrons
- 8. a chemical bond formed when atoms share three pairs of electrons
- 10. atoms of the same slements that have diffrent numbers of nutrons
- 11. the possible locations around a nucleus where electrons may be found
- 12. in an atom when it has more protons then electrons
- 17. positivly charged particles located in the nucleus of an atom
- 18. the number of protons in the nuclus electrons
- 21. the smallest part of an element that still has the same properties as the element(i.e melting and boiling point)