Question

Using a part of the periodic table given below answer the following questions:
(i) Na has physical properties similar to which elements and why?
(ii) Write the electronic configuration of N and P.
(iii) State one property common to fluorine and chlorine.

$$\begin{array}{ccccccccc}GroupPeriod& I& II& III& IV& V& VI& VII& Zero\\ 1& H& & & & & & & He\\ 2& Li& Be& B& C& N& O& F& Ne\\ 3& Na& Mg& Al& Si& P& S& Cl& Ar\\ 4& K& Ca& & & & & & \end{array}$$

Answer 1

i) Na has similar properties as Li and K. It is so because elements in the same group have similar properties due to the same number of valence electrons.

ii) Electronic configuration of N is: 2,5.

Electronic configuration of P is: 2,8,5.

iii) Both have 7 electrons in the valence shell. They are highly reactive and are present in the form of gases at room temperature.