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Gr 8 CH INTERACTIONS
Chapter 2 Atoms and Bonding
| Question | Answer |
|---|---|
| atom | a nucleus surrounded by one or more electrons |
| nucleus | the tiny, central core of a atom that contains protons and neutrons |
| protons | atomic particles with a positive charge |
| neutrons | atomic particles with no charge |
| electrons | atomic particles with a negative charge |
| valence electrons | the electrons farthest from the nucleus; involved in bonding |
| electron dot diagram | a symbol of an element surrounded by dots each representing one valence electron |
| atomic number | the number of protons in an atom |
| group | family; elements in the same vertical column in the periodic table |
| period | the elements in the same row in the periodic table |
| ionic bond | the attraction between two oppositely charged ions |
| ion | an atom or group of atoms that become electrically charged by gaining or losing a valence electron |
| polyatomic ions | ions that are made of more than one atom |
| crystal | ions forming an orderly, three-dimensional arrangment |
| covalent bond | a chemical bond formed when two atoms share electrons |
| double bond | two pairs, or four electrons, are shared |
| molecular bonds | molecules with covalently bonded atoms |
| polar | a bond in which electrons are shared unequally |
| nonpolar | a bond in which electrons are shared equally |
| mineral | a naturally occurring solid that has a crystal structure and a definite chemical composition |
Created by:
Dcoleman
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