List of top Chemistry Questions on Periodic Classification of Elements

Which of the following sets contain atomic numbers of only representative elements? \[ \begin{aligned} \text{I.} \quad & 3,\;33,\;53,\;87 \\ \text{II.} \quad & 2,\;10,\;22,\;36 \\ \text{III.} \quad & 9,\;35,\;51,\;88 \\ \text{IV.} \quad & 17,\;25,\;37,\;48 \end{aligned} \] The correct answer is

The correct statement(s) regarding the periodic properties of elements is(are)

Given below are two statements:
Statement (I): The 4f and 5f-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:

Identify the elements \(x\) and \(z\) in the following representation. (Sb = antimony)

The correct order of ionic radii for the ions, P\(^{3-}\), S\(^{2-}\), Ca\(^{2+}\), K\(^{+}\), Cl\(^{-}\) is: