Rewrite the following statements after correction, if necessary :

(i) Elements in the same period have equal valency

(ii) The metallic character of elements in a period increases gradually on moving from left to right.

Arrange the following elements in increasing order of their atomic radii.

Li, Be, F, N

Arrange the following elements in the in increasing order of their metallic character :

Mg, Ca, K, Ga

Fill in the blanks in the following statements :

(a) The horizontal rows ____

(b) In going across a period (right to left) in periodic table, the atomic size of the atom _______

(c) On moving from right to left in the second period, the number of valence electrons _______

(d) On going down in a group in the periodic table, the metallic character of elements _______

(e) The tendency to gain an electron ______ on moving down in a group of the periodic table.

Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the periodic table. Write the electronic configurations of these two elements. Which of these will be more electronegative ?Why ?