Ch106 - Periodic table trends

Periodic Law
The properties of the elements are
periodic functions of their atomic
number

S orbital single orbital

p orbital three degenerate
d orbital five degenerate
f orbital seven degenerate
One orbital fits two electrons
up and down spin


Main group

FEYYLT.gs
jj

, Effective nuclear charge Positive charge
experienced by an electron from the
nucleus

ENC increases across the period
Nuclear charge inner electrons


ENC decreases down the group

Atomic radius Measured as half the
distance between two nuclei

d
rA Z

d
Going across period decreases atomic radius
caused by increasing ENC


Going down a
group increases atomic radius
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