a) mention the fundamental propertyof element which formed the basis of modern periodic table and state the modern periodic law
b) mention the period to which Na, Mg, andAl belong to .justify their position in the modern periodic table.

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Solution

(a)fundamental property of element is there atomic number
periodic law- 'properties of elements are a periodic function of their atomic number'
(b)Na, Mg and Al belong to 3^rd period in periodic table.

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a) mention the fundamental propertyof element which formed the basis of modern periodic table and state the modern periodic lawb) mention the period to which Na, Mg, andAl belong to .justify their position in the modern periodic table.

(a)fundamental property of element is there atomic number periodic law- 'properties of elements are a periodic function of their atomic number' (b)Na, Mg and Al belong to 3rd period in periodic table.

a) mention the fundamental propertyof element which formed the basis of modern periodic table and state the modern periodic law
b) mention the period to which Na, Mg, andAl belong to .justify their position in the modern periodic table.

(a)fundamental property of element is there atomic number
periodic law- 'properties of elements are a periodic function of their atomic number'
(b)Na, Mg and Al belong to 3^rd period in periodic table.