Periodic Properties of the Elements

Periodic Properties of the Elements - P eriodic P roperties...

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Periodic Properties of the Elements Dmitire Menedelevve and Lothar Meyer independently come up with the same idea of how elements should be grouped Menedelevve predicted the existence of germanium EFFECTIVE NUCLEAR CHRAGE Zeff=Z-S o Z=total e- o S(screening constant)=Core c- Positive charge experienced by an electron. Shielding effect of negatively charged electrons prevents higher orbital electrons from experiencing the nuclear charge of the core electrons . Larger electron cores are less able to screen the outer electrons from the nucleus charge Holding valence electrons is the attraction to the nucleus INCREASE IN Zeff causes the NUCLEUS to draw the ELECTRONS IN CLOSER
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SIZE OF ATOMS / ATOMIC RADIUS Bonding atomic radius is ½ of the distance between coventaly bonding nuclei IN PERIOD atomic radius decreases as you go across a period o Due to Increase in effective nuclear charge IN FAMILY atomic radius decreases as you go Down the family Increase in E- means increase in size
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