Biology vocabulary

2. a unique substance that consists of two of more elements combined in fixed proportion
3. a molecule in which one end of the molecule is slightly positive, while the other end is slightly negative.
6. the act, state, or process of sticking together of alike molecules or entities.
8. an atom of a group of atoms that carries a positive or negative electric change as a result of having lost or gained one or more electrons
9. the tendency of dissimilar particles or surfaces to cling to one another
11. a type of chemical bond that is formed when electrons are shared equally between two atoms.
12. formed by the equal sharing of electrons from both participating
13. the bond formed by the complete transfer of valence electron to attain stability

1. covalent bond in which the atoms have an unequal attraction for electrons, and so the sharing is unequal.
4. a pure substance consisting of only one type of atom which all have the same numbers of protons in their nuclei
5. a variation of an element that possesses the same atomic number but a different mass number
7. An uncharged elementary particle that has mass nearly equal to the proton and is present in all known atomic nuclei except the hydrogen nucleus
9. A particle of matter that uniquely defines a chemical element
10. A subatomic particle with a particle electrical charge