KWL CHART--ELECTRONS WHAT DO I ALREADY KNOW ABOUT ELECTRONS? WHAT DO I WANT TO KNOW CONCERNING ELECTRONS? WHAT HAVE I LEARNED TODAY ABOUT ELECTRONS?

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Presentation transcript:

KWL CHART--ELECTRONS WHAT DO I ALREADY KNOW ABOUT ELECTRONS? WHAT DO I WANT TO KNOW CONCERNING ELECTRONS? WHAT HAVE I LEARNED TODAY ABOUT ELECTRONS?

GPS STANDARD SC3. Students will use the modern atomic theory to explain the characteristics of atoms. b. Use the orbital configuration of neutral atoms to explain its effect on the atom’s chemical properties. f. Relate light emission and the movement of electrons to element identification

ELECTROMAGNETIC SPECTRUM In order of increasing energy: Radio, microwaves, infrared, visible light, uv, xrays, gamma, cosmic

Facts About Electrons 1.They can only move certain distances from the nucleus. 2.They can only move at certain speeds. 3. They give off (release) energy when moving to a lower level and gain energy (absorb) when moving to a higher level. 4.They cannot jump down to a level with a full octet of electrons.

The Bohr Model He said that electrons occupy definite energy levels around the nucleus. However, exact locations of electrons are not known because they are constantly moving due to the loss/gain of energy. Therefore, these locations are only highly likely places to find electrons at a certain time.

Photons They are bundles or packets of energy When an atom gains photons, it becomes excited and the electrons move to a higher energy level. When it loses photons, it gives off photons, e- move to lower level (ground state). Atoms become excited ( and gain photons) by heating them or passing electricity through them. When they lose these photons, the electrons give off color, depending on amount of energy given off (related to frequency and wavelength).

Wave Characteristics WAVELENGHTH—distance from crest to crest or trough to trough FREQUENCY—# of waves passing a certain point per second ; is measured in Hertz (Hz) AMPLITUDE—the height or depth of a wave SPEED—is determined by wavelength & freq. All electromagnetic waves travel at the speed of light (300,000,000 m/sec)