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Ch B Chemistry
Discovering Atomos Lessons 5 and 6
| Question | Answer |
|---|---|
| valence electrons | an electron found in the outermost (usually incompletely-filed) orbital of an atom; determine how an element combines with other elements |
| molecules | a group of two or more atoms linked by a chemical bond; the small independent unit of a compound |
| covalent bonding | a chemical bond between two (generally similar) elements; occurs when one atom shares electron(s) with another atom, creating a bond between the two atoms as they both attract the shared electron |
| ionic bond | a chemical bond between two (general dissimilar) elements; occurs when one atom gives electrons to the other atom, making both atoms into ions that bond with each other |
| molecular mass | the combined masses of each atom in a molecule |
| Lewis structures | electron dot diagrams developed by Gilbert Newton Lewis in the early 1900s to illustrate valence electrons in elements; used to show the changes in electron orbital structures caused by chemical bonding |
| mole | a group of atoms or molecules that total 6.02 x 10 to the 23rd power; a convenient conversion unit for chemistry calculations |
| compound | two or more elements combined chemically; has different chemical properties than those of its individual elements, and it can only be separated by chemical means |
| anion | an atom that has gained an electron; have more electrons than protons, giving them a negative charge |
| cation | an atom that has lost an electron; have more protons than electrons, giving them a positive charge |
Created by:
MrsHough
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