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

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