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6. a shorthand method of describing the arrangement of electron shells of an atom
8. a state of matter that have a definite shape and volume
10. a process occuring at the surface of a liquid involving the change of state of liquid into gas at a temperature below the boiling point
13. a substance which cannot be further divided into simpler substances by chemical method
14. any basic unit of matter and energy
15. The process by which different substances mix as a result of the random motions of their particles
16. A solid where particle are arranged in definite way giving specific shape
18. ability to do force
20. tranfers thermal energy to its surroundings, leading to an increase in the temperature of the surroundings

1. the smallest part of an element that can exist as a stable entity
2. decrease in size if cooled
3. a state of matter that has neither definite shape and volume
4. the temperature at which solid melts into liquid
5. helps to explain the way matter behaves
7. A group of atoms covalently bonded together
9. a vertical column of the periodic table containing elements with the same number of electrons in their outer electron shell
11. horizontal rows of the periodic table
12. increase slightly in size when heated
17. a state of matter that has a definite volume and moves by flowing
19. Anything which occupies space and mass