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Assertion (A) : Anything that influence...

Assertion (A) : Anything that influences of the valence electorns will affect the chemistry of the element. So, the nuclear molar mass does not affect the valence shell.
Reason (R ) : Nucleus contains protons and neutrons, whereas protons i.e. nuclear charge affects the valence shell but neutrons doe not.

A

If both Assertion (A) and (R ) are correct and Reason (R ) is the correct explanation of Assertion (A).

B

If both (A) and (R ) are correct but (R ) is not the correct explanation for (A).

C

If (A) is correct but (R ) is not correct.

D

If (A) and (R ) are correct

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the assertion and reason provided in the question, we can break it down step by step. ### Step 1: Understand the Assertion **Assertion (A)** states that anything that influences the valence electrons will affect the chemistry of the element. It further claims that the nuclear molar mass does not affect the valence shell. ### Step 2: Analyze the Reason **Reason (R)** explains that the nucleus contains protons and neutrons. It states that while protons (nuclear charge) affect the valence shell, neutrons do not. ### Step 3: Evaluate the Assertion - Valence electrons are the outermost electrons in an atom and are crucial for chemical bonding and reactions. - The assertion correctly identifies that factors influencing valence electrons will impact the chemistry of the element. - However, the statement that nuclear molar mass does not affect the valence shell requires further clarification. While the mass itself does not directly influence the valence electrons, the nuclear charge (which is related to the number of protons) does play a significant role in determining the behavior of valence electrons. ### Step 4: Evaluate the Reason - The reason provided is accurate in stating that the nucleus contains protons and neutrons. - Protons contribute to the nuclear charge, which affects the attraction of valence electrons. - Neutrons, being neutral, do not directly influence the charge experienced by the valence electrons. ### Step 5: Conclusion Both the assertion and reason are correct. The reason provided is a valid explanation for the assertion. Therefore, the correct answer is that both the assertion and reason are true, and the reason is the correct explanation for the assertion. ### Final Answer Both Assertion (A) and Reason (R) are correct, and Reason (R) is the correct explanation of Assertion (A). ---
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Anything that influences the valence electrons will affect the chemistry of the element. Which one of the following factors does not affect the valence shell ?

Anything that influences the valence electrons will affect the chemistry of the element. Which one of the following factors does not affect the valence shell ?

Knowledge Check

  • Anything that influences the valence electrons will affect the chemistry of the element. Which one of the following factors does not affect the valence shell ?

    A
    Valence principal quantum number(n)
    B
    Nuclear charge(Z)
    C
    Nuclear mass
    D
    Number of core electrons

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    Assertion (A) : Nucleus of the atom does not contain electrons, yet it emits beta- particles in the form of electrons. Reason (R): In the nucleus , protons and neutrons exchange mesons frequently.

    Assertion : Nuclear forces arise from strong coulombic interactions between protons and neutrons Reason : Nuclear forces are independent of charge of the nucleons

    Assertion (A) : Neutrons have no charge but protons are positively charged, hence net result is repulsion in them in the nucleus of an atom. In the presence of this repulsion the nucleus is highly stable. Reason (R) : The pair of nucleons (neutrons and protons) continuously exchanges the charge through mesons which may either be positively or negatively charged.

    The emission of beta particle is from A)The valence shell of an atom B)The inner shell of an atom C)The nucleus due to the nuclear conversion : Proton rarr neutron + electron D)The nucleus due to the nuclear conversion : neutron rarr proton + electron

    Nuclear charge actually experienced by an electron is termed as effective nuclear charge. The effective nuclear charge Z^(**) actuall ydepends on type of shell and orbital in which electron is actually present. The relative extent to which the various orbitals penetrate the electron clouds of other orbitals is s gt p gt d gt f (for the same value of n) The phenomenon in which penultimate shell electrons act as screen or sheild in between nucleus and valence shell electrons and thereby reducing nuclear charge is known as shielding effect. the penultimate shell electrons repel the valence shell electron to keep them loosely held with nucleus. it is thus evident that more is the shielding effect, lesser is the effective nuclear charge and lesser is the ionization energy. Q. Which of the following valence electron experience maximum effective nuclear charge?

    Nuclear charge actually experienced by an electron is termed as effective nuclear charge. The effective nuclear charge Z^(**) actuall ydepends on type of shell and orbital in which electron is actually present. The relative extent to which the various orbitals penetrate the electron clouds of other orbitals is s gt p gt d gt f (for the same value of n) The phenomenon in which penultimate shell electrons act as screen or sheild in between nucleus and valence shell electrons and thereby reducing nuclear charge is known as shielding effect. the penultimate shell electrons repel the valence shell electron to keep them loosely held with nucleus. it is thus evident that more is the shielding effect, lesser is the effective nuclear charge and lesser is the ionization energy. Q. Which of the following valence electron experience maximum effective nuclear charge?

    Nuclear charge actually experienced by an electron is termed as effective nuclear charge. The effective nuclear charge Z^(**) actuall ydepends on type of shell and orbital in which electron is actually present. The relative extent to which the various orbitals penetrate the electron clouds of other orbitals is s gt p gt d gt f (for the same value of n) The phenomenon in which penultimate shell electrons act as screen or sheild in between nucleus and valence shell electrons and thereby reducing nuclear charge is known as shielding effect. the penultimate shell electrons repel the valence shell electron to keep them loosely held with nucleus. it is thus evident that more is the shielding effect, lesser is the effective nuclear charge and lesser is the ionization energy. Q. Ionzation enegy is not influenced by:

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