Basic Atomic Structure

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Presentation transcript:

Basic Atomic Structure AP Chem. Chapter 2

Atomic Particles Particle Charge Mass (amu) Mass (kg) Location Electron -1 1/1000 = 0 9.109 x 10-31 Electron cloud Proton +1 1 1.673 x 10-27 Nucleus Neutron 1.675 x 10-27

Format for writing isotopes of atoms A X Z element symbol (X) atomic number (Z) = number of protons mass number (A) - atomic number (Z) = number of neutrons.

Mass Number Nuclide p+ n0 e- Mass # (Z) Mass number is the number of protons and neutrons in the nucleus of an isotope. Mass # (z)= p+ + n0 Nuclide p+ n0 e- Mass # (Z) Oxygen - 10 - 33 42 - 31 15 18 8 8 18 Arsenic 75 33 75 Phosphorus 16 15 31

Isotopes Isotopes are atoms of the same element having different masses due to varying numbers of neutrons. Isotope Protons Electrons Neutrons Nucleus Hydrogen–1 (protium) 1 Hydrogen-2 (deuterium) Hydrogen-3 (tritium) 2