State the main aim of classifying elements. Which is the more fundamental property of elements that is used in the development of Modern Periodic Table ? Name and state the law based on this fundamental property. On which side of the periodic table one can find metals, non-metals and metalloids?

Explanation

(i) Aim of classification : Systematic study of the known elements.
(ii) Basic property : Atomic number.
(iii) Properties of the elements are a periodic function of their atomic numbers.
(iv) Metals on the left.
(v) Non-metals on the right.
(vi) Metalloids at the border of metals and beginning of non-metals.