Chemistry

2. The smallest particle of a chemical element that can exist
5. Atomic number can also be known as ______ number
7. motion When particles are close together,they collide and move in all directions. This is known as ______ motion
8. The arrangement of electrons in the different electronic shells is known as __________ configuration
10. It is formed when an atom loses or gains electrons
12. Solids ______ about in fixed positions
13. The process of a solid changing to a gas
14. A _______ solution has a pH of 7
15. The total number of protons and neutrons in an atom
16. It is formed when two or more non-metal atoms chemically combine together
18. _______ have the same number of protons but different number of neutrons

1. The arrangement of gas particles
3. A process that occurs at any temperature
4. It occurs when particles move from high concentration to low concentration
6. A substance which changes colour depending on whether the solution tested is acidic or alkaline
8. A substance which cannot be broken down into simpler forms
9. Acids and alkalis are __________ solutions
11. Alkalis are _____ that are soluble in water
17. It is made up of two or more different elements chemically combined together
19. The forces of attraction between liquid particles