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Published byLynette Lynch Modified over 8 years ago
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ATOMIC STRUCTURE An atom is the smallest particle of matter that retains the properties of the element. An atom is composed of ______ subatomic particles.
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ATOMIC STRUCTURE In a neutral atom, the # of electrons must equal the # of ___. The identity of the atom is based on the # of _________________. PARTICLEMASSCHARGE ELECTRONVirtually none (1/1840) Negative PROTON1 AMUPositive NEUTRON1 AMU (slightly more massive than proton) neutral
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ATOMIC STRUCTURE When atoms of the same element contain different #s of neutrons they are called __________. An atom has an overall charge of ____. When an atom loses or gains electrons, an ___________ forms. A cation forms when an atom loses electrons. (+ charge) An anion forms when an atom gains electrons. (- charge)
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Nucleus Contains Protons (p + ) and Neutrons (n) the mass of the atom Electron Cloud Region around nucleus where electrons (e - ) move the volume of an atom Atomic Structure 1 st energy level (2 e - ) 2 nd energy level (8 e - ) 3 rd energy level (18 e - ) 4 th energy level (32 e - )
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Electron Energy Levels ENERGY LEVEL# OF ELECTRONS 12 electrons 28 electrons 318 electrons 432 electrons 5 Valence electrons are the electrons in the outer most energy level.
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C 6 12.001 Atomic Number: # of protons in nucleus (also the # of electrons) Average Atomic Mass: average mass of the mixture of isotopes Chemical Symbol: abbreviation for the name of an element (1 st letter caps, 2 nd letter lower case)
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12 6 C 14 6 C Mass Atomic number Isotopes of Carbon
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Atomic Calculations Element Atomic # # of Protons # of Electrons Charge on nucleus Mass number Number of neutrons He24 2039 3545
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