Classification ...

Elements of which of the following group $$\left ( s \right )$$ of periodic table do not from hydrides.

Which of the following is incorrect statement?

Four elements $$P,\ Q,\ R,\ S$$ have atomic numbers $$Z-1,\ Z,\ Z+1$$ and $$Z+2$$ respectively. If $$Z$$ is 17, then bond between which pair of elements will be most ionic?

Which of the following has the least electron affinity?

Which of the following pair has electron deficient compounds?

General electronic configuration of outermost and penultimate shell is $$\left( {n - 1} \right)\,\,{s^2}\,\,\left( {n - 1} \right){p^{6\,\,}}\left( {n - 1} \right)\,{d^x}\,\,n{s^2}$$. If $$n = 4$$ and $$x = 5$$   then number of protons in the nuleus will be :-

Which of the following contains three centre and two electron bonds?

Which of the following group bear maximum number of elements?

 Which of the following order is correct?

In period $$2$$, element $$'A'$$ is to the right of element $$'B'$$.Compare the following properties of A and B.