(a) Explain the terms 'valency' and 'variable valency'.
(b) How are the elements with variable valency named ? Explain with an example.
Question 41 Properties of the elements are given below. Where would you locate the following elements in the periodic table?
(a) A soft metal stored under kerosene.
(b) An element with variable (more than one) valency stored under water.
(c) An element which is tetravalent and forms the basis of organic chemistry.
(d) An element which is an inert gas with atomic number 2.
(e) An element whose thin oxide layer is used to make other elements corrosion resistant by the process of “anodizing”.
What is variable valency ? Name two elements having variable valency and state their valencies.