It is supposed that ununtrium is similar to thallium.
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You would see which group the element was in and then replace it with another element from the same group, as all elements in a group have similar properties. For example you could replace Sodium with Potassium as they are both in Group 1.
Each chemical element has specific chemical and physical properties.
Strontium (Sr) would have properties similar to calcium (Ca) since they belong to the same group in the periodic table (Group 2) and have similar chemical behaviors. They both have two valence electrons and exhibit similar reactivity patterns.
There is no element named quadium. There is ununquadium (Element 114), which is its underneath lead and to the right of ununtrium. There was an element named Unnilquadium, but it is now Rutherfordium (Rf). Due to how that type of element name works, Quadium would simply be Element #4--which was discovered in 1798 and was named Beryllium thirty years later.
Cadmium (Cd) has similar properties to zinc (Zn) due to their proximity in the periodic table. Both elements are transition metals, have similar reactivity, and share some common chemical properties.