(a) State three features of the nuclear model of an atom put forward by Rutherford.
(b) An atom has atomic number 12, Write the name of the element and its valency.
(a) Define valency of an element. What valency will be shown by an element having atomic number 14 ?
(b) What is the relation between the valency of an element and the number of valence electrons in its atoms ? Explain with examples.