Question

What is the name of the 120th element in the periodic table?

Answer 1

Hint: In chemistry, an element is a pure substance made up entirely of atoms with the same number of protons in their nuclei. Chemical elements, unlike chemical compounds, cannot be broken down chemically into simpler molecules.

Complete answer:
As of now (2020), the periodic table has proven up for the element with atomic number 118, and no elements with atomic numbers larger than 118 have effectively been incorporated. Nonetheless, extended periodic table models predicted chemical elements other than these 118.
According to this, Unbinilium, also known as eka-radium or element 120 in the periodic table, is a hypothetical chemical element with atomic number 120. Unbinilium and Ubn are the temporary IUPAC names and symbols for this element. These are, however, temporary names that are used until the element is discovered, verified, and a permanent name is determined.
Unbinilium's position as the seventh alkaline earth metal suggests that it will have properties similar to its lighter congeners; nonetheless, relativistic influences may cause some of its properties to diverge from what would be predicted if periodic trends were applied straight.
While it should show the characteristic +2 oxidation state of the alkaline earth metals, it is also projected to show the +4 oxidation state, which is unknown in any other alkaline earth metal. Unbinilium is projected to be less reactive than barium and radium and behave more like strontium.
And hence Unbinilium is the 120th element in the periodic table.

Note:
Despite several attempts by German and Russian teams, unbinilium has yet to be synthesised. The period 8 elements would be significantly more difficult to synthesise than the previous known elements, according to experimental evidence, and unbinilium may be the last element that can be synthesised with existing technology.