Given below are two statements:
Statement (I): The 4 and 5- series of elements are placed separately in the Periodic table to preserve the principle of classification.
Statement (II): s-block elements can be found in pure form in nature.
In the light of the above statements, choose the most appropriate answer from the options given below: [2024]
Both Statement I and Statement II are false
Statement I is false but Statement II is true
Statement I is true but Statement II is false
Both Statement I and Statement II are true
(3)
Statement I: Outermost shell for 4f series elements is 6th shell, hence these are placed in 6th period. Outermost shell for 5f series elements is 7th shell, hence these are placed in 7th period. This is a true statement.
Statement II: s-block elements are highly reactive and are not found in pure form in nature.
If IUPAC name of an element is ''Unununnium" then the element belongs to nth group of Periodic table. The value of n is _________ . [2024]
(11)
Unununnium is 111 (un mean 1, nium is added as a convension).
Element with atomic number 118 is last element of periodic table i.e., belongs to group 18. Starting backwards, 117 → group 17, 116 → group 16, 115 → group 15, 114 → group 14, 113 → group 13, 112 → group 12, 111 → group 11.
