Flash Card
X and Y are two elements having similar properties which obey Newlands's Law of Octaves. The minimum number of elements in between X and Y is ................. .
According to Mendeleev's periodic law, properties of elements are periodic function of their......... .
In modern periodic table, the number of groups and periods are ......... and ........... respectively.
A student was asked to select two elements in a periodic table. He selects neon and argon. In both these elements, the number of electrons in the outermost shell is......... .
Alkaline earth metals have valency 2. This means that their position in the modern periodic table is in......... .
The element eka-silicon in Mendeleev's periodic table is known as .............. in the modern periodic table.
Electronic configuration of element X is 2, 8, 2. It belongs to............ in the modern periodic table.