The sixth period transition element with properties mist similar to Ni is platinum with symbol Pt, because both these elements are in Column 10 of a wide form Periodic Table.
Pt
The element that would have properties most similar to the new element would be an element that lies in the same group as the new element. Specifically, the element with the most similar properties will lie directly above or below that element in the group.
Lanthanides have properties similar to Cerium
It has similar properties to the element with proton number 20, which is calcium.
Fluorine or Bromine have similar properties to chlorine because both are halogens.
Pt
Elements in the same family, or group, have similar physical and chemical properties.
The element that would have properties most similar to the new element would be an element that lies in the same group as the new element. Specifically, the element with the most similar properties will lie directly above or below that element in the group.
Lanthanides have properties similar to Cerium
It has similar properties to the element with proton number 20, which is calcium.
Selenium.
Fluorine or Bromine have similar properties to chlorine because both are halogens.
Only caesium has the same properties as caesium. There are other elements which have some similar properties.
Buttholes
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It is supposed that ununtrium is similar to thallium.
Elements present within a same group normally have similar properties