In periodic table '3^(rd) ' period contains eight and not eighteen elements. Justify.

Development of periodic law and periodic table are the consequences of systematising the knowledge of elements. Of the following, which scientist did not contribute towards of development of periodic table?

In the modern periodic table, the period indicates the value of

Two students were analysing the electronic configurations of the first 30 elements of the Periodic Table as part of an assignment. They found that two elements showed difference from other twenty eight elements. a) Which are the two elements?

Which elements show similarity in chemical properties in groups and periods in the periodic table? (Noble gases, Representative elements transition elements, Lanthanoids)

Two students were analysing the electronic configurations of the first 30 elements of the Periodic Table as part of an assignment. They found that two elements showed difference from other twenty eight elements. Why they show this anomalous behavior?

Two students were analysing the electronic configurations of the first 30 elements of the Periodic Table as part of an assignment. They found that two elements showed difference from other twenty eight elements. Write their electronic configurations.

The first element of a group in the periodic table of elements after shown the ressemblance to the second element of the neighbouring group on the right, which is.

The figure of an incomplete periodic table is given below. : Which one of these elements show -2 oxidation state?

Evaluate the Mendeleev's periodic table and find the following. Are the same elements showing similar properties arranged in the same group or same period?

The figure of an incomplete periodic table is given below. Which of these element has the highest ionization energy ?