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Chapter 2&3: elements, compound & mixture, Atomic structure -…
Chapter 2&3: elements, compound & mixture, Atomic structure
element
a pure substance that cannot be broken down into two or more simpler substances by chemical reactions
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Atoms
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inside atoms- made up of protons, neutrons & electrons ( subatomic particles )
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electrons are held within the atom by an electrostatic forces of attraction between them and the positive charge of the protons in the nucleus
proton- relative charge +1, relative mass of 1
neutron- relative charge of 0, relative mass 1
electron- relative charge -1, relative mass 1/1840
molecule
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diatomic molecules - are those that are formed by the combination of two atoms ex. cl2 , o2, h2
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isotopes
are different atoms of the same element that have the same number of protons but different numbers of neutrons
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different physical properties- different mass, density and diffusion differ
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