Question

How were the elements arranged in the modern periodic table ? Why ?​

Answer 1

Answer:

In the modern periodic table, the elements are arranged according to their atomic number - not their relative atomic mass . ... rows, called periods , in order of increasing atomic number. vertical columns, called groups , where the elements have similar properties.

Answer 2

Answer:

In the modern periodic table, the elements are arranged according to their atomic number - not their relative atomic mass . ... rows, called periods , in order of increasing atomic number. vertical columns, called groups , where the elements have similar properties.

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