Chapter 2-1
Terms
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- Atom
- basic unit of matter
- Nucleus
- the center of the atom which contains the protons and neutrons; in cells, structure that contains the cell's genetic material (DNA) and controls the cell's activities
- Electron
- negatively charged particle; located outside the atomic nucleus
- Element
- substance consisting entirely of one type of atom
- Isotope
- atom of an element that has a number of neutrons different from that of other atoms of the same element
- Compound
- substance formed by the chemical combination of two or more elements in definite proportions
- Ionic Bond
- bond formed when one or more electrons are transferred from one atom to another
- Ion
- atom that has a positive or negative charge
- Covalent Bond
- bond formed by the sharing of electrons between atoms
- Molecule
- smallest unit of most compounds
- van der Waals forces
- a slight attraction that develops between the oppositely chargedregions of nearby molecules