the number of protons in the nucleus and the number of electrons in the valence orbital
Elements with same property are grouped together. Property can be estimated by its position.
What elements are similar to iron in a chemical property on the Periodic Table
atomic no. or basically according to the no. of electrons in their outermost shell whcih reflect the property of individual atom
what property does each of the elements have
Density
atomic number
Position of Periodic Table describes chemical properties. it is estimated from its position in table.
Atomic number is the fundamental property. Elements are arranged in order of increasing atomic number.
The properties of elements are found to be periodic when arranged according to atomic number. Hence atomic number is considered as base for arranging the elements.
colour of the elemrnt
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Mendeleev created his Periodic Table at the time when presence of sub-atomic particles like electrons, protons and neutrons were not discovered.So, the term atomic number was not known till now. So , he positioned the elements in increasing order of atomic mass because Atomic Mass of many elements discovered till then were known.