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Noble gasses are not reactive. :)
Mole fraction is dimensionless. It's the amount of moles of species "A" divided by the total amount of moles in the mixture. So "mole A / mole total" equals "dimensionless". To add clarity in the use of mole fractions, one could add as "unit" mole A / mole "mixture".
A lanthanide element is any element that resides in the Lanthanide series on the Periodic Table. The Lanthanide series is just under the Actinide series on the Periodic Table and is usually seperated from the main part of the Periodic Table. All of the Lanthanide elements are radioactive.
Fluorine is in the Halogen Group.
Only Fluorine belongs in the halogen family.
The maximum number is 8.
They are silvery metals that conduct electricity
they are harder than alkali metals
actinides are the group of elements in the periodic table,see..........
Group 1 is on the leftmost of periodic table.It is a group of Alkali metals.It consists of Lithium,Sodium,Potassium and Caesium.
They are very reactive.
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