Question

write down the three basis of arrangement of elements in the modern periodic table​

Answer 1

Answer:

It's all about how many electrons an element has. Hydrogen has 1 electron, therefore it is the first in the table. It is also important that the elements are sorted into different categories, from left to right, alkali metals, nonmetals, metals, poor metals, gases and noble gases. In terms of how reactive they are the closer it is to the bottom left corner, the more reactive they are, whereas the top right corner is the least reactive. Lanthanoids and Actinoids are reactive metals but they are on the bottom of the table because it would be too long otherwise.

Answer 2

Answer:

According to the Modern periodic law , the properties of the element and their compounds  are a periodic function of their atomic numbers . When elements are placed according to atomic number , then similar electronic configuration are repeated after regular interval . Hence elements are placed in periodic table according to in increasing atomic number,Z.

Explanation:

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