periodic table

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

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)