Choose the option which describes best this statement :
"The modern periodic table is based upon".
A
Atomic mass of the elements
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B
Number of neutrons in the nucleus
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C
Number of isotopes of an element
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D
Oxidation states
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E
Number of protons in the nucleus
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Solution
The correct option is E Number of protons in the nucleus The periodic table is a tabular arrangement of the chemical elements, ordered by their atomic number (number of protons), electron configurations, and recurring chemical properties.
This ordering shows periodic trends, such as elements with similar behaviour in the same column.
It also shows four rectangular blocks with some approximately similar chemical properties.
In general, within one row (period) the elements are metals on the left, and non-metals on the right.