Question

एलिमेंट बिलॉन्ग टू द सम ग्रुप हैव टू सम वैलेंसी​

Answer 1

Answer:

(1) The valency of an element is determined by the number of valence electron in the outermost shell of an atom of an element. <br> (2) All the elements in a group have the same number of valence electrons. Therefore, elements in the same group should have the same valency. For example, the elements of group I contain only one valence electron, the valency of elements of group I is one. Similarly for group II, the valency is two.