Question

give reason why a periodic table
based on the atomic number​

Answer 1

Answer:

It was found that the chemical properties of an element depends on the no. of electron and their arrangement and not on the total no. of neutron and proton in a nucleus of an element. So the elements were arranged in increasing order of the atomic number.

Explanation:

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Answer 2

Answer:

Explanation:

The classification of elements by atomic number allows us to understand many properties of the atom and makes it possible to predict behaviors instead of just having to memorize everything