Chapter 2 chemistry - Atoms are small compose everything...

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Atoms - are small - compose everything - are pieces of elements Properties of atoms determine properties of elements Proved by J.J. Thomson and others – atom had electrons Electron is a particle that smaller than atoms and carry a negative charge Rutherford’s conclusion - nucleus is neutron + protons - numbers of protons = numbers of electrons Protons, p Electron, e Neutron, n Live in nucleus Live in empty space Live in nucleus Elements Each element has unique number of protons The number of protons in the nucleus of an atom is atomic number Periodicity - Metal - Metalloid - Nonmetal
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Metals - solids under room temperature - reflective surface - heat and electricity conductors - can be shaped - flexible without losing toughness - lose electrons and form cations in reactions - lower left on the periodic table Nonmetals - found in solid, liquid and gas - poor heat and electricity conductors - solid but easily to break - gain electrons in reactions to become anions - upper right on the periodic table Metalloids - show
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