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Task 18a (cosmetic) (manual): eval 2 templates: del empty params (2×);

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{{Infobox element
|number=81
|symbol=Tl
|name=thallium
|abundance=
|abundance in earth's crust=
|abundance in oceans=
|abundance in solar system=
|left=[[mercury (element)|mercury]]
|right=[[lead]]
|above=[[indium|In]]
|below=[[nihonium|Nh]]
|group=13
|period=6
|block=p
|image name=Thallium pieces in ampoule.jpg
|appearance=silvery white
|electrons per shell=2, 8, 18, 32, 18, 3
|phase=
|density gpcm3nrt=11.85
|density gpcm3mp=11.22
|melting point K=577
|melting point C=304
|melting point F=579
|boiling point K=1746
|boiling point C=1473
|boiling point F=2683
|heat fusion=4.14
|heat vaporization=165
|heat capacity=26.32
|vapor pressure 1=882
|vapor pressure 10=977
|vapor pressure 100=1097
|vapor pressure 1 k=1252
|vapor pressure 10 k=1461
|vapor pressure 100 k=1758
|vapor pressure comment=
|crystal structure=hexagonal close packed
|electronegativity=1.62
|number of ionization energies=3
|ionization energy 1=589.4
|ionization energy 2=1971
|ionization energy 3=2878
|atomic radius=170
|covalent radius=145±7
|Van der Waals radius=196
|magnetic ordering=[[diamagnetic]]
|magnetic ordering ref=<ref>{{cite book |url=https://web.archive.org/web/20110303222309/http://www-d0.fnal.gov/hardware/cal/lvps_info/engineering/elementmagn.pdf|chapter=Magnetic susceptibility of the elements and inorganic compounds| editor = Lide, D. R. | title = CRC Handbook of Chemistry and Physics | edition = 86th | location = Boca Raton (FL) | publisher = CRC Press | year = 2005 | isbn = 0-8493-0486-5 }}
</ref>
|electrical resistivity unit prefix=µ
|electrical resistivity at 20=0.18
|thermal conductivity=46.1
|thermal expansion at 25=29.9
|speed of sound rod at 20=818
|magnetic susceptibility= −50.9·10<sup>−6</sup>
|magnetic susceptibility ref= (298 K)<ref>{{Cite book|title=CRC, Handbook of Chemistry and Physics|last=Weast|first=Robert|publisher=Chemical Rubber Company Publishing|year=1984|isbn=0-8493-0464-4|location=Boca Raton, Florida|pages=E110}}</ref>
|Young's modulus=8
|Shear modulus=2.8
|Bulk modulus=43
|Poisson ratio=0.45
|Mohs hardness=1.2
|Brinell hardness=26.5–44.7
|CAS number=7440-28-0
|isotopes=
{{infobox element/isotopes stable | mn=203 | sym=Tl | na=29.5% | n=122 |firstlinks=yes}}
{{infobox element/isotopes decay2 | mn=204 | sym=Tl
|na=[[synthetic radioisotope|syn]] | hl=3.78 y
|dm1=[[beta emission|β<sup>−</sup>]] | de1=0.764 | link1=lead-204 | pn1=204 | ps1=Pb
|dm2=[[electron capture|ε]] | de2=0.347 | link2=mercury-204 | pn2=204 | ps2=Hg}}
{{infobox element/isotopes stable | mn=205 | sym=Tl | na=70.5% | n=124 |firstlinks=no}}
|isotopes comment=
|naming=after Greek ''thallos'', green shoot or twig
|discovered by=[[William Crookes]]
|discovery date=1861
|first isolation by=[[Claude-Auguste Lamy]]
|first isolation date=1862
|QID=Q932
}}<noinclude>
{{Infobox element/element navigation|symbol=Tl}}
{{template reference list}}
{{documentation|1=Template:Infobox element/doc}}
</noinclude>

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setup>Monkbot: Task 18a (cosmetic) (manual): eval 2 templates: del empty params (2×);