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Ms.Watts/ Ms. Ibrahim - Physical Science:Compounds, Mixtures and Elements
Terms in this set (19)
A pure substance containing only one atom.
Cannot be separated into simpler materials (except during nuclear reactions).
Over 100 existing elements are listed and classified on this table.
A pure substance containing two or more kinds of atoms. They are chemically combined.
Compounds come together to form groups of atoms.
Two or more elements or compounds NOT chemically combined. No reaction between substances.
Mixtures can be separated into their components by....
chemical or physical means
Something that is Homogeneous ( uniform), is :
a compound which is always together. .Compounds cannot be separated by any physical means.
are known for being uniform/ homogeneous.
can be non-uniform or heterogeneous.
Mixtures can be separated
into their components by chemical or physical means.
The properties of a mixture are similar to
the properties of its components.
Dmitri Mendeleev (1869)
Periodic table of Elements, organized elements in order of atomic weights
Henry Moseley (1913)
(English Physicist) developed Moseley's Law which showed a relationship between atomic wavelength and atomic number. This caused the "shuffling" of the Periodic Table to be organized by atomic number and not atomic mass.
Cannot be broken down into any other simpler substance
Symbol and Element Name
Shorthand for the element name
the number of protons in the nucleus of an atom
Number of protons and neutrons
equal number of protons and electrons
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