The highest ionization energy is exhibited by _____.

Which of the following oxides is neutral?

Which of the following is arranged in order of increasing radius?

What is the electronic configuration of the elements of group 14?

Among the following elements, which has the least electron affinity?

What is the basic theme of organisation in the periodic table?

X, Y, and Z are three members of a Dobereiner's triad. If the atomic mass of X is 7 and that of Z is 39, what is the atomic mass of Y?

Which properties of the elements depend on the electronic configuration of the atoms and which do not?

Write the number designation of a group that has 2 electrons beyond a noble gas configuration.

What is the most important cause of periodicity?

What is the basic difference in approach between the Mendeleev’s Periodic Law and the Modern Periodic Law?

Which important property did Mendeleev use to classify the elements in his periodic table and did he stick to that?

What would be IUPAC names and symbols for elements with atomic numbers 122,127,135,149 and 150?

All transition elements are d-block elements, but all d-block elements are not transition elements. Explain.

Which has a larger radius?
(i) Mg or Ca
(ii) 5 or Cl

What are representative elements?

(i) Which orbitals are filled with electrons in third period?
(ii) Which of the lanthanoids is man-made element?
(iii) To which series do man-made elements belong?

What do you understand by exothermic reaction and endothermic reaction? give one example of each type.

Define the term ionization enthalpy? How does it vary along a period and along a group?

Considering the atomic number and position in the periodic table, arrange the following elements in the increasing order of metallic character : Si, Be, Mg, Na, P.

Justify the given statement with suitable examples "the properties of the elements are a periodic function of their atomic number".