Chemistry Task

3. the tendency of electrons to prefer to have eight electrons in the valency shell
7. a substance that increases the rate of a chemical reaction without itself undergoing any chemical permanent change
9. a negatively charged ion
11. when a reaction absorbes heat
14. an atom or molecule with a net electric charge due to the loss or gain of one or more electrons
15. a flammable hydrocarbon gas of the alkane series, present in natural gas and used as bottled fuel
17. the outer mostshell of electrons
19. having electrical or magnetic *******
20. an uncharged atomic particle that has a mass nearly equal to that of the proton
21. each of the actual or potential patterns of electron density which may be formed in an atom or molecule by one or more electrons, and can be represented as a wave function
22. a pair of equal or oppositely charged or magnetized poles separated by a distance

1. a colourless, odorless flammable gas which is the main constituent of natural gas
2. the charge number of an atomic nucleus
4. a positively charged ion
5. a Danish physicist who made foundational contributions to understanding atomic structure and quantum theory
6. a stable subatomic particle with a charge of negative electricity
8. a homogenous mixture of two or more substances
10. the mass of an atom of a chemical element
12. relating to or denoting chemical bonds formed by the sharing of electrons between atoms
13. the combining power of an element
16. when a reaction releases heat
18. the smallest particle of a chemical element that cam exist