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The periodic classification of elements is an arrangement of the elements in order of their
Atomic Weights
Isotopic Weights
Molecular Weights
Atomic Numbers
Atomic Masses
Explanation
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Here is an explanation:
The periodic table law states that properties of elements are periodic function of their atomic number. Although the periodic table law proposed by Dmitri Mendeleev was that elements are arranged in order of increasing atomic weight but it was later modernized that elements do not differ with increasing atomic weight in the periodic table but with there atomic number
REF: Check: New school Chemistry, page 140 by Osei Yaw Ababio(4th Edition)
Elements in the periodic table are arranged according to there atomic number(proton number).electronegativy increase frm left 2 right while atomic radius increases down the group.
According to d modern periodic law,the valence electrons of elements in dsame period increase progressively by one meaning dat d no of outermost shell increases i.e d atomic number as we across d period.Dats jst d REAL EXPLANATION.
D: Atomic numbers, thats the new functioning periodic law stating that the properties of each elements are the periodic functions of their atomic numbers. So i think thats all
The ionization energy increases from left to right across a period while down the group it decreases, the electronegativity also increases across a period and decreases down the down the group, atomic radius decreases across a periods and increases down the group.
The question is ambiguous! According to Dmitriv Ivanovish Mendeèlev, the perodicity of element are a function of their atomic mass! The question should read," According to the modern classification of elements, the perodicity of element varies or is a function of"... Then the answer would be atomic number!
Periodicity of elements in the periodic table increases across the period due to increase in the atomic number of the elements
Based on the periodic law which was restated by Henry Moseley " the properties of an element are a periodic function of their atomic number".
The elements in the periodic table are arranged by the
increasing number of their atomic numbers. Elements
with similar properties are kept together in a vertical
column while the horizontal period contains elements
that show a pattern of change in their physical
properties.
U all contributed immensely nd I also like ur curiosity@Chemvik but I must say dat d position of an element in d periodic table is determined by d its atomic number nd not d mass no.
atomic number can be likened to the serial number of the elements, so it is used to arrange the elements in the periodic table. it is the no of protons which is also the number of electrons and it determines the shell number or shell configuration
According to the modern periodic law it states that 'the properties of an element is the periodic function of it atomic number'so definately it obvious dat its atomic number