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The physical and chemical properties of ...

The physical and chemical properties of the elements denpend upton their atomic number rather than atomic masses because

A

an atom consists of a nucleus surrounded by electrons

B

atomic mass is a nuclear property and depends upon the number of protons and neutrons in the nucleus while atomic number inplies the number of electron in the extranculear part

C

the chemical properties of the elements depend upon the interaction between the atom and the reagent. The nucleus is deep inside the taom, shielded by ectrons in the extranuclear part while electrons are exposed to the reagent

D

Both`(1)`and`(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
The physical and chemical properties depends upon the number of electrons and their electronic configuration.
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Knowledge Check

  • Assertion: According to Mendeleev periodic properties of elements are the function of their atomic numbers. Reason: Atomic number is equal to number of neutrons.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion
    C
    If assertion is true but reason is false
    D
    If both assertion and reason are false

  • Assertion (A): According to Mendeleev, periodic properties of elements is a function of their atomic number. Reason (R): Atomic number is equal to the number of protons.

    A
    Both A and R are true and R is the correct explanation of A.
    B
    Both A and R are true but R is NOT the correct explanation of A.
    C
    A is true but R is false.
    D
    A is false and R is true.

  • Many elements have non-integral atomic masses because

    A
    their isotopes have same number of neutrons
    B
    their isotopes have non-integral
    C
    they exist as isotopes
    D
    their consititurnts neutrons,protons and electrons combine to give fractional masses

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    “The physical and chemical properties of the elements are periodic function of their respective atomic weights”. This statement was given by

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    The elements with atomic numbers geater than 100 are:

    The elements are identified by their atomic numbers and not by their mass numbers. Justify.

    Answer question numbers (a) - (d) on the basis of your understanding of the following paragraph and related studied concepts. In 1913, Henry Moseley showed that the atomic number (symbolised as Z) of an element is a more fundamental property than its atomic mass. Accordingly, Mendeleev's Periodic Law was modified and atomic number was adopted as the basis of Modern Periodic Table and the Modern Periodic Law can be stated as follows : 'Properties of elements are a periodic function of their atomic number.' Let us recall that the atomic number gives us the number of protons in the nucleus of an atom and this number increases by one in going from one element to the next. Elements, when arranged in order of increasing atomic number, lead us to the classification known as the Modern Periodic Table. Prediction of properties of elements could be made with more precision when elements were arranged on the basis of increasing atomic number. (c) Differentiate between atomic weight and atomic number.

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