Chapter Six
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Atomic mass
The average number of protons and neutrons in the nucleus of particular elements
Atomic number
The number of protons in the nuclei of the atoms of a particular element
Chemical formula
An expression of the elements in a compound and their ratios in which the elements are denoted by their chemical symbols.
Compound
Two or more elements different elements chemically bonded together.
Crystal
The atomic structure of a substance held together by ionic bonds, characterized by the orderly arrangement of atoms in a rigid lattice structure.
Crystal lattice
The structural framework in which the atoms are arranged in a crystal.
Dissociation
When the ions in a crystal lattice come apart and go into solution during the process of dissolving.
Element
A substance characterized by being composed of atoms all possessing the same amount of protons in the nucleus.
Heterogeneous mixture
A mixture in which the presence if at least two different substances is visible to the eye, possibly with the aid of a microscope.
Homogeneous mixture
A mixture with a composition that is uniform all the way down to the molecular level.
Ion
An atom with a net charge due to loss or gain of at least one electron.
Isotope
Atoms with varying amounts of neutrons.
Metalloid
The category of seven elements on the periodic table possessing qualities of both metals and non metals.
Mixture
A combination of substances that occurs without abt chemical reaction. Substances in the mixture retain their own properties and may be separated from one another by physical means such as filtration and boiling.
Molecule
A structure composed of multiple atoms.
Pure substance
An element or compound.