Question

What is the significance of atomic no in the modern periodic table classification of elements explain with eg

Answer 1

atomic no. decides the position and properties of that element .see it says tht the modern periodic table relates the periodicity of the atom

Answer 2

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Atomic no = Number of protons = Number of electrons

1. It distinguish a element with other elements because no two elements can have the same atomic number



2. It help in finding the position of an element for example

The element with atomic no 17
electronic configuration will be 2,8,7 this element will be placed in 3rd period of group 17 or 7A because no of shells determined it period and no of electrons in the outermost shell determine its group


3. atomic no help in finding the electronic configuration of an element
ex - an element with atomic no 7
electronic configuration will be 2,5 because 2 electrons can be in First K shell and maximum of 8 in second L shell



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