Question

Use the letters only written in the Periodic Table given below to answer the questions that follow :
(i) State the number of valence electrons in atom $J$.
(ii) Which element shown forms ions with a single negative charge?
(iii) Which metallic element is more reactive than $R$?
(iv) Which element has its electrons arranged in four shells?

Answer 1

(i) J belongs to the fifth group hence, it has 5 valence electrons.

(ii) M belongs to group number VII hence, it has 7 valence electrons. To attain stability it needs to gain 1 electron and thereby it forms single negative charged ion.

(iii) T is more reactive than R. The reactivity of an element increases down the group.

(iv) The period number indicates the number of shells present hence, T is the element which is having its electrons arranged in four shells.