Chemistry terms

8. Reaction - A process that involves rearrangement of the molecular or ionic structure of a substance.
10. Bond - A chemical bond that involves the sharing of electron pairs between atoms.
12. - Elements that are poor conductors of heat and electricity.
13. - A substance that reduces the hydrogen ion concentration in a solution.
16. - A group of atoms bonded together.
17. - Atoms of the same element with different numbers of neutrons.
19. - A substance formed from two or more elements chemically united in fixed proportions.
20. Bond - A chemical bond formed between two ions with opposite charges.

1. - Elements that are good conductors of heat and electricity.
2. - A subatomic particle with a negative charge.
3. Electrons - The electrons in the outer shell of an atom that are involved in forming bonds.
4. - A scale used to specify the acidity or basicity of an aqueous solution.
5. - An atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
6. - The basic unit of a chemical element.
7. - A subatomic particle with a positive charge found in the nucleus of an atom.
9. - Elements with properties intermediate between metals and nonmetals.
11. Table - A table of the chemical elements arranged in order of atomic number.
14. - A subatomic particle with no charge found in the nucleus of an atom.
15. - A substance that increases the hydrogen ion concentration in a solution.
18. - A substance that cannot be broken down into simpler substances.