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Two elements have similiar characteristics when they belong to the same family that means that have placed in the same column of the periodic table. So in other words, Helium and Radon are very similar because they are in the same column. Let me know if you need others :)
Some pairs of elements that have similar properties is helium and radon.
The periodic table refers to a tabular display of the chemical elements. It depicts the organized array of all the chemical elements based on their increasing atomic number.
Some pairs of elements that have similar properties is helium and radon. It should be noted that they are both colorless and highly radioactive. They also have a short half life.
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