Science Corssword

5. a type of model of an atom
6. a substance having a finite activation energy (band gap) for electron conduction
8. members of a family of an element that all have the same number of protons but different numbers of neutrons
9. a row of chemical elements
10. the number of a chemical element in the periodic system
11. any substance that cannot be decomposed into simpler substances by ordinary chemical processes
13. a negatively charged subatomic particle
15. a type of chemical element which has a preponderance of properties in between
17. a column in the periodic table of the chemical elements

1. Russian chemist who developed the periodic classification of the elements
2. are neutral sub-atomic particles with no electrical charge
3. smallest unit into which matter can be divided without the release of electrically charged particles
4. stable subatomic particle that has a positive charge
7. a chemical bond that involves the sharing of electron pairs between atoms
12. any of a class of substances characterized by high electrical and thermal conductivity
14. any substance composed of identical molecules consisting of atoms of two or more chemical elements
16. any atom or group of atoms that bears one or more positive or negative electrical charges