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9 terms

IB Chemistry: The periodic table and physical properties

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group 1
alkali metals
group 7
halogens
group 8
noble gases
atomic radius
increases right to left, bottom to top
ionic radius
increases top to bottom, right to left
Electronegativity
increases left to right, bottom to top
Periodicity
the repeating pattern of phsical properties shown by the different periods
melting points of elements in group 1
the melting points decrease down the group as the atoms become larger and the strength of metallic bond decreases
melting points of elements in group 7
the van der waals attractive forces between diatomic molecules increase down the group so the melting points increase