The Atom.

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Presentation transcript:

The Atom

An atom refresher An atom has three parts: - proton -neutron -electron Proton = positive The proton is found in the center of the atom, a place called the nucleus. Picture from http://education.jlab.org/qa/atom_model_03.gif

An atom refresher Neutron = no charge The neutron is also found in the nucleus. Picture from http://education.jlab.org/qa/atom_model_03.gif

An atom refresher Electron = negative The electron is located outside the nucleus in shells which orbit the nucleus Mass of an electron is about 1000 times smaller than a proton. Picture from http://education.jlab.org/qa/atom_model_03.gif

O Oxygen Periodic Table Atomic Number: Number of protons and it is also the number of electrons in an atom. 8 O Oxygen 16

O Oxygen Periodic Table 8 Element’s Symbol: An abbreviation for the element. O Oxygen 16

Periodic Table 8 O Oxygen Elements Name 16

O Oxygen Periodic Table 8 Atomic Mass/Weight: Number of protons + neutrons. 16

Practice!!!! 3 Li Lithium 7

Practice!!!! 11 Na Sodium 23