Basic atomic Structure and Mass 2.2

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Presentation transcript:

Basic atomic Structure and Mass 2.2

Atomic Particles Particle Charge Mass # Location Electron -1 Electron cloud Proton +1 1 Nucleus Neutron

Atom with the Electron Cloud Electrons are not in set Orbitals.

Nuclear Forces

Atomic Radii

Charles-Augusten de Coulomb 1785

Coulombs forces The closer the electron; the stronger the force

Atomic Number Atomic number (Z) of an element is the number of protons in the nucleus of each atom of that element. Element # of protons Atomic # (Z) Carbon 6 Phosphorus 15 Gold 79

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

Dmitri Mendeleev 1869

Dmitri’s Periodic Table

Modern Periodic Table

Atomic Number for an Selenium Top = superscript

Atomic Number

Atomic Mass for an Selenium Bottom = subscript

Atomic Mass

Isotope and Hyphen notation

Isotope and Nuclear notation

Calculating Average Atomic Mass