Chemistry

2. symbol/a notation for one of the chemical elements
4. model/a model of the atom
5. substance made from only 1 type of atom
6. of elements based on number of electrons in the last shell
7. particle similar mass to a proton but with no electric charge
10. of light
11. metals/low-density, low-melting, white, soft, high reacting metallic elements
14. forms of an element, same number of protons with a different number of neutrons
17. element from one of the 15 metallic elements
21. positively charged ion
24. atom with both non-metal and metal properties
26. number/number of protons and neutrons in the nucleus
28. negatively charged ion
29. level/the energy state of an atom

1. mixture of separate elements
3. gases/any elements in group 18 of the periodic table
5. with negative charge found in atoms
8. shells/outermost shell of an atom
9. metals/any elements from group 3-12 on the periodic table
12. state/the lowest energy state of an atom
13. shell/grouping of electrons surrounding the nucleus of an atom
15. of shells used by an element
16. state/higher state of energy than ground state
18. elements from groups 89-103
19. of an atom containing protons and neutrons
20. atom with a different electric charge due to the loss or gain of an electron
22. configuration/arrangement of electrons
23. bond/the complete transfer of valence electrons
25. smallest particle of a chemical element
27. electrons/an electron in the outer shells that can form chemical bonds with other atoms